A list of adjectives that start with O can be found below. These examples of adjectives may be especially helpful for those in school or in college perhaps taking online classes toward a degree, or in another program looking for adjectives starting with o, and o adjectives. The adjective lists on this site might also benefit people who enjoy learning about language and words, or who spend time writing reports or articles.
OA: oafish, oaken.
OB: obedient, obeisant, obese, objectionable, objective, obligational, obliged, oblique, oblivious, oblong, obnoxious, obscene, obscure, obsequious, observable, observant, observational, obsessive, obsolescent, obsolete, obstinate, obtainable, obvious.
OC: occasional, occidental, occipital, occlusive, occupational, oceanic, oceanographic, octagonal, ocular.
OD: odd, odious.
OE: oedipal.
OF: offbeat, offensive, offhand, official, officious, offshore.
OH: ohmic.
OI: oily.
OK: ok, okay.
OL: ol, old, olde, olden, older, oldest, ole, oleophilic, oleophobic, olive, olivefaced, olympian, olympic.
See more – O adjectives for people
OM: ominous, omniscient.
ON: oncoming, one, oneasy, onerous, onetime, only, onrushing, ontological.
OP: opalescent, opaque, open, operable, operatic, operational, operative, opinionated, opportune, opportunistic, opposite, oppressive, optical, optimal, optimistic, optimum, optional, opulent.
OR: oral, oratorical, orbital, orchestral, orderly, ordinary, organic, organisational, organismic, organizational, orgiastic, oriental, original, ornate, ornery, orney, ornraier, orphic, orthodontic, orthodox, orthographic, orthopedic, orthorhombic, orwellian.
OS: osmotic, osseous, ossified, ostensible, ostentatious.
OT: other, otherworldly.
OU: outback, outboard, outdoor, outer, outgoing, outlandish, outlying, outmoded, outraged, outrageous, outright, outside, outsized, outspoken, outstanding, outstate, outward, outworn.
OV: oval, over, overactive, overage, overaggressive, overall, overbearing, overblown, overcerebral, overconfident, overcurious, overdue, overeager, overgenerous, overhand, overhead, overjoyed, overloud, overnight, overprotective, overrated, overseas, oversize, oversized, oversoft, overt, overvaulting, overweight, overwhelming, overwrought, oviform.
OW: own, owne.
OX: oxaloacetic.
By number of letters
2: ok, ol
3: odd, old, ole, one, own
4: oily, okay, olde, only, open, oral, oval, over, owne
See more – positive O adjectives
5: oaken, obese, ohmic, olden, older, olive, orney, other, outer, overt
6: oafish, oblong, ocular, odious, oldest, oneasy, opaque, ornate, ornery, orphic
7: obliged, oblique, obscene, obscure, obvious, oceanic, oedipal, offbeat, offhand, olympic, ominous, onerous, onetime, optical, optimal, optimum, opulent, orbital, orderly, organic, osmotic, osseous, outback, outdoor, outside, outward, outworn, overage, overall, overdue, oviform
8: obedient, obeisant, obsolete, official, offshore, olympian, oncoming, operable, operatic, opposite, optional, ordinary, oriental, original, ornraier, orthodox, ossified, outboard, outgoing, outlying, outmoded, outraged, outright, outsized, outstate, overhand, overhead, overloud, overseas, oversize, oversoft
9: objective, oblivious, obnoxious, observant, obsessive, obstinate, occipital, occlusive, octagonal, offensive, officious, onrushing, operative, opportune, orgiastic, orwellian, outspoken, overblown, overeager, overjoyed, overnight, overrated, oversized
10: obsequious, observable, obtainable, occasional, occidental, oleophilic, oleophobic, olivefaced, omniscient, opalescent, oppressive, optimistic, oratorical, orchestral, organismic, orthopedic, ostensible, outlandish, outrageous, overactive, overweight
11: obsolescent, ontological, operational, opinionated, orthodontic, outstanding, overbearing, overcurious, overwrought, oxaloacetic
12: obligational, occupational, orthographic, orthorhombic, ostentatious, otherworldly, overcerebral, overgenerous, overvaulting, overwhelming
13: objectionable, observational, oceanographic, opportunistic, overconfident
14: organisational, organizational, overaggressive, overprotective
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Organized
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