Adjectives that Start with O | List of 1000+ Adjectives Starting with O

There is a huge list of adjectives that start with O in English. Adjectives are the part of speech that modify nouns or pronouns. The qualify, limit, or specify, providing more information about the noun or pronoun.

Adjectives that Start with O

The letter O is ripe with adjectives. There are several prefixes that can be added to words to make a new adjective.

  • Omni: means “all” or every.” Example: omnidirectional
  • Open: means “accessible” or “having no enclosure.” Example: openhanded
  • Out: as an adjective, out generally means “more than” or “better than.” Example: outgrow
  • Over: as an adjective, over generally means “upper” or “higher.” Example: overhead

Some of these words will include a hyphen and some may not. Regardless of grammatical rules, in casual writing, the hyphen may or may not be present.

Some words with these prefixes are included here, but there are many more possibilities.

List of Descriptive Adjectives that Start with O

Below are 100 descriptive adjectives that start with O.

  • Oak
  • Oaken
  • Obligated
  • Obliging
  • Oblique
  • Obliterable
  • Obliterated
  • Oblivious
  • Oblong
  • Obscure
  • Observable
  • Observant
  • Obstinate
  • Obstructed
  • Obstructive
  • Obtainable
  • Obtrusive
  • Obtuse
  • Obvious
  • Occasional
  • Occipital
  • Occluded
  • Occupational
  • Occupied
  • Oceanic
  • Ochre
  • Octangular
  • Octogenarian
  • Odious
  • Odorless
  • Off
  • Offbeat
  • Offensive
  • Offhand
  • Official
  • Offshore
  • Offstage
  • Old
  • Olden
  • Older
  • Olfactory
  • Olive
  • Omissible
  • Oncological
  • Oncoming
  • One
  • Ongoing
  • Only
  • Onshore
  • Opaque
  • Open
  • Opening
  • Operant
  • Operating
  • Opinionated
  • Opponent
  • Opportunist
  • Opposite
  • Optic
  • Optional
  • Oral
  • Orange
  • Orbital
  • Orchestral
  • Ordained
  • Ordeal
  • Ordered
  • Ordinary
  • Oriental
  • Oriented
  • Ornate
  • Orthopedic
  • Orwellian
  • Ostensive
  • Other
  • Out
  • Outbound
  • Outdoor
  • Outgoing
  • Outlandish
  • Ovation
  • Overage
  • Overall
  • Overcast
  • Overcoming
  • Overhead
  • Overland
  • Overly
  • Overnight
  • Overshot
  • Overstuffed
  • Overt
  • Overweight
  • Ovid
  • Own
  • Owned
  • Ownerless
  • Oxidized
  • Oxlike

List of Positive Adjectives that Start with O

Below are 70 adjectives that start with O that indicate something positive.

  • Obedient
  • Objective
  • Obligated
  • Obliging
  • Observable
  • Observant
  • Observational
  • Obtainable
  • Obvious
  • Occurrent
  • Official
  • OK
  • Okay
  • Olympian
  • Olympic
  • Omnibus
  • Omnidirectional
  • Omnipotent
  • Omnipresent
  • Omniscient
  • On
  • One
  • Onetime
  • Ongoing
  • On-going
  • Online
  • Only
  • Opalescent
  • Opaline
  • Open
  • Opened
  • Open-ended
  • Openhearted
  • Opening
  • Open-minded
  • Operable
  • Operant
  • Operatic
  • Operating
  • Operational
  • Operative
  • Opportune
  • Opportunist
  • Opportunistic
  • Optimal
  • Optimistic
  • Optimum
  • Optional
  • Opulent
  • Oracular
  • Orchestral
  • Ordained
  • Ordered
  • Orderly
  • Organic
  • Organized
  • Orientated
  • Orientating
  • Oriented
  • Original
  • Originative
  • Ornamental
  • Ornate
  • Orotund
  • Orthodox
  • Over
  • Overabundant
  • Overall
  • Overjoyed
  • Overt

List of Negative Adjectives that Start with O

Below are 50 adjective words that start O that indicate something negative.

  • Oafish
  • Obdurate
  • Obese
  • Objectionable
  • Obligated
  • Obligational
  • Obligatory
  • Obliterable
  • Obsessive
  • Obsolete
  • Obstinate
  • Obstreperous
  • Obstructed
  • Obstructive
  • Obtrusive
  • Obtuse
  • Obvious
  • Occluded
  • Occult
  • Occupied
  • Odd
  • Odious
  • Off
  • Offensive
  • Oily
  • Old
  • Oldest
  • Omissible
  • Omissive
  • Only
  • Oozy
  • Opponent
  • Opportunist
  • Opportunistic
  • Opposite
  • Oppressive
  • Outcast
  • Outclassed
  • Outdated
  • Outlaw
  • Outlawed
  • Outmoded
  • Outraged
  • Outrageous
  • Overactive
  • Overaged
  • Overaged
  • Overbearing
  • Overburdened
  • Owing

List of Personality Adjectives that Start with O

Below are 30 adjectives that start with O that describe a personality.

  • Oafish
  • Obedient
  • Objective
  • Obliging
  • Obnoxious
  • Obsessional
  • Obsessive
  • Obstinate
  • Officious
  • Opinionated
  • Optimistic
  • Organized
  • Ostentatious
  • Outgoing
  • Outraged
  • Overachieving
  • Overanxious
  • Overbearing
  • Overconcerned
  • Overcritical
  • Overemotional
  • Overexcited
  • Overfocused
  • Overindulgent
  • Overjoyed
  • Overmodest
  • Overprotective
  • Overwhelmed
  • Overwrought
  • Overzealous

List of Adjectives that Start with O to Describe a Person (not Personality)

Below are 50 adjectives that describe a person that start with O.

  • Objectionable
  • Obscene
  • Odd
  • Odious
  • Offensive
  • OK
  • Okay
  • Old
  • Older
  • Oldish
  • Open
  • Openhanded
  • Orderly
  • Ordinary
  • Outcast
  • Outclassed
  • Outdated
  • Outdoorsy
  • Outgoing
  • Outlandish
  • Outlaw
  • Outmoded
  • Outrageous
  • Outright
  • Outspoken
  • Outspread
  • Outstanding
  • Overachiever
  • Overbooked
  • Overburdened
  • Overcharged
  • Overcoached
  • Overcommitted
  • Overcounted
  • Overdeveloped
  • Overdosed
  • Overdressed
  • Overeducated
  • Overexerted
  • Overexerting
  • Overexposed
  • Overextended
  • Overfatigued
  • Overfed
  • Overfulfilled
  • Overinformed
  • Overnighter
  • Oversteered
  • Overweight
  • Overwhelming

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Adjectives that Start with O | List of 1000+ Adjectives Starting with OPin

List of Adjectives that Start with O

Adjectives that Start with Oa, Ob

  • Oafish
  • Oak
  • Oaken
  • Obdurant
  • Obdurate
  • Obedible
  • Obedient
  • Obediential
  • Obedt
  • Obeisant
  • Obeisaunt
  • Obese
  • Obfuscatory
  • Obituary
  • Object-based
  • Objectionable
  • Objectionable
  • Objectional
  • Objective
  • Objectless
  • Object-oriented
  • Objectual
  • Oblate
  • Oblationary
  • Obligate
  • Obligated
  • Obligational
  • Obligatory
  • Obliged
  • Obliging
  • Oblike
  • Oblimin
  • Oblique
  • Obliquid
  • Oblite
  • Obliterable
  • Obliterated
  • Obliterative
  • Oblivious
  • Oblong
  • Obnoxious
  • Obscene
  • Obscurant
  • Obscure
  • Obsequious
  • Observable
  • Observant
  • Observational
  • Observed
  • Observing
  • Obsessed
  • Obsessional
  • Obsessive
  • Obsignatory
  • Obsolescent
  • Obsolete
  • Obsoleter
  • Obstacle-ridden
  • Obstacular
  • Obstetric
  • Obstetrical
  • Obstetricious
  • Obstetrick
  • Obstinant
  • Obstinate
  • Obstreperous
  • Obstructed
  • Obstructive
  • Obstruent
  • Obtainable
  • Obtrusive
  • Obtuse
  • Obtuse-angled
  • Obverse
  • Obviating
  • Obvious

Adjectives that Start with Oc

  • Occasional
  • Occidental
  • Occipital
  • Occluded
  • Occlusal
  • Occluse
  • Occlusional
  • Occlusive
  • Occulent
  • Occulomotor
  • Occult
  • Occultic
  • Occultistic
  • Occultive
  • Occultural
  • Occupational
  • Occupiable
  • Occupied
  • Occurrent
  • Ocean-going
  • Oceanic
  • Oceanward
  • Ocellar
  • Ocellated
  • Ocher
  • Ochre
  • Ochreous
  • Ochrous
  • Ocreate
  • Octabasic
  • Octacore
  • Octacosanoic
  • Octacyclic
  • Octagonal
  • Octahedral
  • Octal
  • Octameric
  • Octangular
  • Octanoic
  • Octogenarian
  • Octogynous
  • Octoic
  • Octoid
  • Octolateral
  • Octolocular
  • Octonary
  • Octonionic
  • Octonocular
  • Octopaminergic
  • Octopartite
  • Octopean
  • Octopetalous
  • Octopian
  • Octopic
  • Octopine
  • Octoploid
  • Octopodal
  • Octopodous
  • Octopoid
  • Octopoidal
  • Octopolar
  • Octosyllabic
  • Octuple
  • Ocular

Adjectives that Start with Od

  • Odd
  • Oddish
  • Odds-on
  • Odd-toed
  • Odic
  • Odiferous
  • Odinic
  • Odious
  • Odobenine
  • Odometric
  • Odometrical
  • Odontoid
  • Odorant
  • Odoriferous
  • Odorless
  • Odorous
  • Odourful
  • Odourless

Adjectives that Start with Oe

  • Oecumenic
  • Oecumenical
  • Oedematous
  • Oedipal
  • Oenological
  • Oenophilic
  • Oestral
  • Oestrogenic
  • Oestrous

Adjectives that Start with Of

  • Off
  • Off-air
  • Off-base
  • Off-beam
  • Offbeat
  • Off-book
  • Off-broadway
  • Off-campus
  • Off-center
  • Off-colour
  • Offduty
  • Offenceless
  • Offended
  • Offending
  • Offensive
  • Off-field
  • Off-guard
  • Offhand
  • Off-hand
  • Official
  • Officiary
  • Officinal
  • Officious
  • Offish
  • Off-key
  • Off-kilter
  • Off-limits
  • Offline
  • Off-line
  • Off-peak
  • Off-piste
  • Off-put
  • Offputting
  • Off-putting
  • Off-road
  • Off-sale
  • Offscreen
  • Off-screen
  • Offshore
  • Offside
  • Offsides
  • Offsite
  • Off-site
  • Offstage
  • Off-street
  • Off-target
  • Off-the-ball
  • Off-the-cuff
  • Off-the-peg
  • Off-the-rack
  • Off-the-record
  • Off-the-shelf
  • Off-the-shoulder
  • Off-the-wall
  • Off-track
  • Off-white
  • Oft-repeated

Adjectives that Start with Og, Oh, Oi

  • Ogival
  • Ogreish
  • Ohmic
  • Oily

Adjectives that Start with Ok, Ol

  • Ok
  • Okay
  • Old
  • Olde
  • Olden
  • Older
  • Oldest
  • Oldfashioned
  • Old-fashioned
  • Old-growth
  • Old-hat
  • Oldish
  • Oldline
  • Old-line
  • Old-maidish
  • Old-school
  • Old-time
  • Old-world
  • Ole
  • Oleaceous
  • Oleaginous
  • Oleanolic
  • Olefinic
  • Oleic
  • Olent
  • Oleochemical
  • Oleographic
  • Oleophilic
  • Oleophobic
  • Oleoresinous
  • Oleose
  • Oleraceous
  • Olfactive
  • Olfactory
  • Oligaemic
  • Oligarchic
  • Oligarchical
  • Oligomeric
  • Oligopolistic
  • Oligosaline
  • Oligosemic
  • Oligosynaptic
  • Oligotrichous
  • Oligotrophic
  • Oliguric
  • Olivary
  • Olive
  • Olivelike
  • Olympian
  • Olympic

Adjectives that Start with Om

  • Omakase
  • Omani
  • Omasal
  • Ominous
  • Omissible
  • Omissive
  • Ommatidial
  • Omnibus
  • Omnipotent
  • Omnipresent
  • Omniscient
  • Omnivorous
  • Omohyoidean
  • Omophagic
  • Omophagous
  • Omosternal
  • Omotic
  • Omphacine
  • Omphacitic
  • Omphalic
  • Omphalinoid

Adjectives that Start with On

  • On
  • On-air
  • Onanistic
  • On-camera
  • On-campus
  • Once-removed
  • Oncogenetic
  • Oncogenic
  • Oncogenomic
  • Oncologic
  • Oncological
  • Oncoming
  • One
  • One-armed
  • One-day
  • One-eighth
  • One-eyed
  • One-fifth
  • One-fourth
  • One-gallused
  • One-half
  • One-handed
  • Oneiric
  • One-legged
  • One-ninth
  • One-note
  • One-off
  • One-on-one
  • One-piece
  • One-pot
  • One-quarter
  • Onerous
  • One-seventh
  • One-shot
  • Onesided
  • One-sided
  • One-sixth
  • One-stop
  • One-tenth
  • One-third
  • Onetime
  • One-time
  • One-to-one
  • One-touch
  • One-track
  • One-way
  • Ongoing
  • On-going
  • On-hand
  • Onioned
  • Onionless
  • Onionlike
  • Oniony
  • Oniric
  • Onirocritic
  • Onkus
  • Onlest
  • Onlie
  • Online
  • On-line
  • Onlooking
  • Only
  • On-off
  • Onomastic
  • Onomatopoeic
  • On-road
  • Onrushing
  • On-scene
  • Onscreen
  • On-screen
  • Onshore
  • Onside
  • Onsite
  • On-site
  • Onstage
  • On-stage
  • On-the-job
  • On-the-spot
  • Ontic
  • Ontogenetic
  • Ontologic
  • Ontological
  • Onward
  • Onygenaceous
  • Onymous
  • Onyx

Adjectives that Start with Oo, Op

  • Oo
  • Oob
  • Oofy
  • Oolitic
  • Oozy
  • Opacating
  • Opacifiable
  • Opacous
  • Opacular
  • Opalescent
  • Opaline
  • Opaque
  • Open
  • Openable
  • Open-air
  • Open-and-shut
  • Open-armed
  • Open-book
  • Opencast
  • Opencut
  • Opened
  • Open-ended
  • Open-eyed
  • Open-faced
  • Open-handed
  • Open-hearted
  • Open-hearth
  • Opening
  • Open-minded
  • Open-mouthed
  • Open-plan
  • Opensightly
  • Opensource
  • Opephoroid
  • Operable
  • Operant
  • Operatic
  • Operating
  • Operational
  • Operationalist
  • Operative
  • Opercular
  • Operculate
  • Operculated
  • Operose
  • Ophidian
  • Ophiolitic
  • Opiate
  • Opinionated
  • Oppilative
  • Opponent
  • Opportune
  • Opportunist
  • Opportunistic
  • Opposable
  • Opposed
  • Opposing
  • Opposite
  • Oppositional
  • Oppositive
  • Oppressed
  • Oppressional
  • Oppressive
  • Opprobrious
  • Opsonic
  • Optative
  • Opthalmic
  • Optic
  • Optical
  • Optimal
  • Optimific
  • Optimistic
  • Optimum
  • Optional
  • Optoelectronic
  • Optokinetic
  • Optomotor
  • Optospintronic
  • Optothermal
  • Optotypic
  • Optronic
  • Opulent
  • Opuntiaceous

Adjectives that Start with Or

  • Oracular
  • Oral
  • Orange
  • Orangey
  • Orangish
  • Orangy
  • Oratorial
  • Oratorian
  • Oratorical
  • Orbicular
  • Orbiculate
  • Orbital
  • Orbitary
  • Orbitual
  • Orbless
  • Orblike
  • Orchestral
  • Orchestrated
  • Orcish
  • Ordained
  • Ordeal
  • Orderable
  • Ordered
  • Orderly
  • Ordinal
  • Ordinary
  • Ordinate
  • Ordurous
  • Orectic
  • Oregonian
  • Organic
  • Organismal
  • Organismic
  • Orgasmic
  • Orgastic
  • Orgiastic
  • Orgulous
  • Orient
  • Oriental
  • Orientated
  • Orientating
  • Orientational
  • Oriented
  • Orienting
  • Origenian
  • Origenist
  • Origenistic
  • Originable
  • Original
  • Originary
  • Originative
  • Originless
  • Orinasal
  • Orinocan
  • Orkish
  • Ornamental
  • Ornate
  • Ornery
  • Ornithogenic
  • Ornithological
  • Ornithophilous
  • Orogastric
  • Orogenic
  • Orogenital
  • Orographic
  • Orographical
  • Orolabial
  • Orolingual
  • Orological
  • Oromucosal
  • Oronasal
  • Oroqen
  • Orosensory
  • Orosirian
  • Orotund
  • Orphaned
  • Orphic
  • Orthodontic
  • Orthodox
  • Orthoepic
  • Orthogenetic
  • Orthogenic
  • Orthognathic
  • Orthogonal
  • Orthograde
  • Orthologous
  • Orthometric
  • Orthopedic
  • Orthoptic
  • Orthorhombic
  • Orthostatic
  • Orthotopic
  • Orthotropic

Adjectives that Start with Os

  • Os
  • Oscillating
  • Oscillatory
  • Oscine
  • Oscitant
  • Osculating
  • Osculatory
  • Osmobiotic
  • Osmolar
  • Osmometric
  • Osmotic
  • Osseous
  • Ossicular
  • Ossiculate
  • Ossiferous
  • Ossified
  • Ossom
  • Os-specific
  • Osteal
  • Ostensible
  • Ostensive
  • Ostentatious
  • Osteoarthritic
  • Osteogenetic
  • Osteogenic
  • Osteoid
  • Osteopathic
  • Osteoporotic
  • Ostial
  • Ostrich-like

Adjectives that Start with Ot

  • Other
  • Otherwise
  • Other-worldly
  • Otic
  • Otoscopic
  • Ototoxic
  • Otterless
  • Otterlike
  • Otter

Adjectives that Start with Ou

  • Out
  • Out of work
  • Out-and-out
  • Outback
  • Outboard
  • Outbound
  • Outbred
  • Outcast
  • Outclassed
  • Outcoming
  • Outcut
  • Outdacious
  • Outdate
  • Outdated
  • Outdoor
  • Outdoorsy
  • Outer
  • Outermost
  • Outfitted
  • Outflowing
  • Outflung
  • Outgoing
  • Outgunned
  • Outjutting
  • Outland
  • Outlandish
  • Outlaw
  • Outlawed
  • Outlined
  • Outlying
  • Outmoded
  • Outmost
  • Out-of-body
  • Out-of-character
  • Out-of-context
  • Out-of-court
  • Out-of-date
  • Out-of-order
  • Out-of-pocket
  • Out-of-print
  • Out-of-service
  • Out-of-state
  • Out-of-town
  • Out-of-work
  • Outraged
  • Outrageous
  • Outright
  • Outshore
  • Outside
  • Outsize
  • Outsized
  • Outspoken
  • Outspread
  • Outstanding
  • Outward
  • Ouvrierist

Adjectives that Start with Ov

  • Oval
  • Ovaloid
  • Ovarian
  • Ovate
  • Ovation
  • Ovenproof
  • Oven-proof
  • Over
  • Overabundant
  • Overachiever
  • Overachieving
  • Overactive
  • Overage
  • Overaged
  • Overaggressive
  • Overalert
  • Overall
  • Overalled
  • Overanxious
  • Overapt
  • Overarm
  • Overattentive
  • Overawed
  • Overbanked
  • Overbearing
  • Overblown
  • Overbold
  • Overbooked
  • Overbreathed
  • Overburdened
  • Overbusy
  • Overcareful
  • Overcast
  • Overcautious
  • Overcharged
  • Overcivilized
  • Overclad
  • Overclaimed
  • Overclear
  • Overclose
  • Overclothed
  • Overcluttered
  • Overcoached
  • Overcoated
  • Overcoatless
  • Overcoming
  • Overcommitted
  • Overcomplicated
  • Overconcerned
  • Overconfident
  • Overconscientious
  • Overconscious
  • Overconsiderate
  • Overcounted
  • Overcritical
  • Overcurious
  • Overdamped
  • Overdelicate
  • Overdependent
  • Overdetermined
  • Overdeveloped
  • Overdocumented
  • Overdominant
  • Overdone
  • Overdoped
  • Overdosed
  • Overdramatic
  • Overdressed
  • Overdue
  • Overeager
  • Overeducated
  • Over-educated
  • Over-elaborate
  • Overemotional
  • Overemphatic
  • Overenthusiastic
  • Overexcitable
  • Overexcited
  • Overexerted
  • Overexerting
  • Overexposed
  • Overextended
  • Overfamiliar
  • Overfatigued
  • Overfed
  • Overflowing
  • Overfocused
  • Overfond
  • Over-fond
  • Overforceful
  • Overforested
  • Overforward
  • Overfragrant
  • Overfraught
  • Overfree
  • Overfreighted
  • Overfrequent
  • Overfriendly
  • Overfriezed
  • Overfruitful
  • Overfucked
  • Overful
  • Overfulfilled
  • Overfull
  • Overfurnished
  • Overfussy
  • Overgenerous
  • Overgreedy
  • Overgrown
  • Overhand
  • Overhanded
  • Overhasty
  • Overhead
  • Overheated
  • Overhyped
  • Overinclusive
  • Overindebted
  • Overintense
  • Overinvested
  • Overinvolved
  • Overionized
  • Overish
  • Overjealous
  • Overjittery
  • Overjoyed
  • Overjoyous
  • Overjubilant
  • Overjust
  • Overkeen
  • Overladen
  • Overland
  • Overlarge
  • Overlayered
  • Overloaded
  • Overlookable
  • Overlooked
  • Overly
  • Overlying
  • Overmastering
  • Overmighty
  • Overmodest
  • Overmotivated
  • Overmuch
  • Overmuscled
  • Overneat
  • Overnew
  • Overnice
  • Overnight
  • Overnighter
  • Overoptimistic
  • Overpessimistic
  • Overplayful
  • Over-polite
  • Overpriced
  • Overproof
  • Overproud
  • Overqualified
  • Overraced
  • Overracked
  • Overrank
  • Overrash
  • Over-rated
  • Overreaching
  • Overreactive
  • Over-reactive
  • Overread
  • Overready
  • Overrefined
  • Overriding
  • Overripe
  • Over-ripe
  • Oversea
  • Overseas
  • Oversensitive
  • Over-sensitive
  • Overserious
  • Oversewn
  • Oversexed
  • Overshot
  • Oversimplistic
  • Oversize
  • Oversized
  • Overslow
  • Oversmoothed
  • Oversnowed
  • Oversocialized
  • Oversoft
  • Oversolar
  • Oversolicitous
  • Oversophisticated
  • Oversparred
  • Overspecific
  • Overspeeding
  • Overstated
  • Oversteered
  • Overstimulated
  • Overstrung
  • Overstuffed
  • Oversubscribed
  • Oversuspicious
  • Overt
  • Over-the-counter
  • Over-the-top
  • Overtight
  • Overtired
  • Overtouristed
  • Overtroubled
  • Overtrusting
  • Overturnable
  • Overturned
  • Overuniform
  • Overvaliant
  • Overwater
  • Overweening
  • Overweight
  • Overwhelmed
  • Overwhelming
  • Overwrought
  • Overzealous
  • Over-zealous
  • Ovid
  • Oviform
  • Ovigerous
  • Oviparous
  • Ovular
  • Ovulational

Adjectives that Start with Ow, Ox

  • Ower
  • Owing
  • Owlish
  • Own
  • Owned
  • Ownerless
  • Oxalic
  • Oxblood
  • Oxeyed
  • Ox-eyed
  • Oxonian
  • Oxyacetic
  • Oxygenic
  • Oxyntic
  • Oxytocic

Adjectives that Start with Oy, Oz

  • Oyster
  • Oysterish
  • Oysterless
  • Oysterlike
  • Oystery
  • Ozone-friendly

Adjectives Starting with O | Image

Adjectives that Start with O | List of 1000+ Adjectives Starting with OPin

Adjectives that Start with O | List of 1000+ Adjectives Starting with OPin

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