Adjective with O
- old
- Orange
- Odd
- Open
- oily
- obedient
- Obese
- Outstanding
- Original
- Ordinary
- Oval
- Obvious
- Obtuse
- Outrageous
- Obnoxious
- Ominous
- oblong
- Ostentatious
- Optimistic
- Opulent
- Outgoing
- oblivious
- Opaque
- Obscure
- Objective
- Organized
- Overt
- Orderly
- Organic
- ornery
- Overweight
- Obsessive
- Okay
- only
- Ornate
- Outlandish
- Omnipotent
- observant
- Obsolete
- Opposite
- Orgasmic
- Older
- onerous
- Obsessed
- Overwhelming
- Obscene
- Olive
- overly
- Offensive
- Overbearing
- Outer
- Opened
- oblique
- Ongoing
- overrated
- Open-minded
- Organised
- Omniscient
- Omnipresent
- Opinionated
- Oversized
- odorous
- Overwhelmed
- octagonal
- Obstinate
- Other
- Optimal
- Ornamental
- Open minded
- One
- otherworldly
- Oafish
- Oppressive
- Optimist
- Obliging
- Overzealous
- Opportunistic
- Overjoyed
- obligatory
- Oozing
- Oozy
- Overpowered
- Ocular
- official
- oscillating
- own
- often
- obstructive
- open minded
- Odious
- oriental
- Overprotective
- Old-fashioned
- Ostensible
- outspoken
- Opalescent
- obsequious
- obviously
- olfactory
- overtly
The words in the list Adjective with O come from players of the word game Categories game.