List of Adjectives that start with O:
  • Oafish
    Oaken
    Oared
    Oaten
    Oath-breathing
    Obdurate
    Obedient
    Obeisant
    Obese
    Objectionable
    Objective
    Objectless
    Oblate
    Obligatory
    Obliged
    Obliging
    Oblique
    Oblivious
    Oblivious of
    Oblivious to
    Oblong
    Obnoxious
    Obscene
    Obscure
    Obsequious
    Observable
    Observant
    Observant of
    Observational
    Obsessive
    Obsolescent
    Obsolete
    Obstetric
    Obstetrical
    Obstinate
    Obstreperous
    Obstructive
    Obtainable
    Obtrusive
    Obvious
    Occasional
    Occidental
    Occipital
    Occlusive
    Occult
    Occupational
    Occupied
    Oceanic
    Octagonal
    Octahedral
    Octavo
    Octogenarian
    Odd
    Odious
    Odoriferous
    Odorous
    Off
    Off-best
    Off-color
    Offensive
    Off-hand
    Off-handed
    Official
    Officinal
    Officious
    Offish
    Offshore
    Off-stage
    Oily
    O.K.
    Old
    Old-maidish
    Oleaginous
    Olfactory
    Oligarchic
    Olive
    Olympian
    Olympic
    Ominous
    Omissible
    Omnibus
    Omnipotent
    Omnipresent
    Omniscient
    Omnivorous
    On
    Once
    On-coming
    One
    One-armed
    One-eyed
    One-horse
    Onerous
    One-sided
    One-way
    Only
    Onomatopoeic
    Onshore
    Ontological
    Onward
    Oozy
    Opalescent
    Opaque
    Open
    Open-air
    Open-and-shut
    Open-eyed
    Open-faced
    Open-handed
    Open-hearted
    Open-minded
    Open-mouthed
    Open to
    Operable
    Operatic
    Operative
    Ophthalmic
    Ophthalmologic
    Opinionated
    Opponent
    Opportune
    Opportunistic
    Opposable
    Opposed
    Opposed to
    Opposite
    Oppressive
    Opprobrious
    Optic
    Optical
    Optimistic
    Optimum
    Optional
    Opulent
    Oracular
    Oral
    Orange
    Oratorical
    Orbit
    Orchestral
    Ordered
    Orderly
    Ordinal
    Ordinary
    Organic
    Organized
    Orgiastic
    Orient
    Oriental
    Original
    Ornamental
    Ornate
    Ornithological
    Orotund
    Orphan
    Orphic
    Orthodox
    Orthogonal
    Orthographic
    Orthographical
    Orthopedic
    Orthorhombic
    Oscillatory
    Osmotic
    Osseous
    Ostensible
    Ostensive
    Ostentatious
    Other
    Otherwise
    Other-worldly
    Otiose
    Ottoman
    Our
    Out
    Out-and-out
    Outboard
    Outbound
    Outdoor
    Outer
    Outermost
    Outgoing
    Outlandish
    Outlying
    Outmoded
    Outmost
    Out-of-date
    Out-of-doors
    Out-of-way
    Outrageous
    Outré
    Outright
    Outside
    Outspoken
    Outstanding
    Outstretched
    Outward
    Outward-bound
    Oval
    Ovarian
    Overabundant
    Over-active
    Overall
    Overbearing
    Overblown
    Overbold
    Over careful
    Overcast
    Overcautious
    Overconfident
    Overcritical
    Overdue
    Overgrown
    Overhand
    Overhead
    Overjoyed
    Overland
    Overmuch
    Overnice
    Overnight
    Over peopled
    Over fined
    Overripe
    Oversea
    Overseas
    Oversensitive
    Over strung
    Over-the-counter
    Overweening
    Overweight
    Overwhelm
    Overwhelming
    Overwrought
    Oviform
    Ovine
    Oviparous
    Ovoid
    Owing
    Owlish
    Own
    Ownerless
    Ox-eyed