What are some adjectives that begin with the letter O?

Adjectives beginning with O:

• oafish
• oak
• oat
• oaten
• oatmeal
• obdurate
• obedient
• obeisant
• obese
• objectionable
• objective
• oblate
• obligated
• obligational
• obligatory
• obliging
• oblique
• oblivious
• oblong
• obnoxious
• obscene
• obscure
• obsequious
• observable
• observant
• observational
• obsessed
• obsessive
• obsolescent
• obsolete
• obstetric
• obstinate
• obstreperous
• obtainable
• obtrusive
• obtuse
• obvious
• occasional
• occidental
• occipital
• occlusive
• occult
• occupational
• occupied
• oceanic
• ocher
• octagonal
• octogenarian
• ocular
• odd
• oddball
• odious
• odorant
• odoriferous
• odorous
• off
• off balance
• off campus
• off color
• off key
• off-color
• offbeat
• offensive
• offhand
• official
• offshore
• often
• oiled
• oily
• okay
• old
• old-fashioned
• old-world
• olden
• older
• oldest
• oleic
• olfactory
• olive
• Olympian
• Olympic
• ominous
• omnipotent
• omnipresent
• omniscient
• omnivorous
• oncoming
• one
• one-sided
• onerous
• onetime
• ongoing
• only
• onrushing
• ontological
• opal
• opalescent
• opaque
• open
• open-ended
• open-minded
• opened
• operable
• operatic
• operating
• operational
• operative
• ophthalmic
• opinionated
• opportune
• opportunistic
• opposing
• opposite
• oppositional
• oppressive
• opprobrious
• optic
• optical
• optimal
• optimistic
• optimum
• optional
• opulent
• oracular
• oral
• orange
• oratorical
• oratory
• orbital
• orchestral
• orchid
• orderly
• ordinary
• organic
• organized (also spelled organised)
• orgasmic
• orgastic
• oriental
• oriented
• original
• ornamental
• ornate
• ornery
• ornithological
• orotund
• orthodontic
• orthodox
• orthogonal
• orthopedic
• oscillating
• ossified
• ostensible
• ostentatious
• other
• otiose
• our
• oustanding
• outback
• outboard
• outbound
• outdated
• outdoor
• outer
• outermost
• outgoing
• outlandish
• outlying
• outrageous
• outright
• outside
• outspoken
• outstanding
• outward
• oval
• ovarian
• ovate
• over
• overactive
• overaggressive
• overall
• overanxious
• overbearing
• overblown
• overboard
• overcast
• overconfident
• overcooked
• overcrowded
• overdeveloped
• overdone
• overdue
• overexposed
• overhead
• overheated
• overjoyed
• overloaded
• overnight
• overpaid
• overpowering
• overpriced
• overprotective
• overqualified
• overrated
• overseas
• oversensitive
• oversize
• oversized
• overstimulated
• overt
• overweight
• overwhelmed
• overwhelming
• overworked
• overwrought
• oviparous
• ovoid
• owlish

Oat

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