Adjective with O
- old
- Orange
- Open
- Odd
- 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
- Opposite
- Obsolete
- Orgasmic
- Older
- Onerous
- Obsessed
- Overwhelming
- Obscene
- overly
- Olive
- Offensive
- Overbearing
- Opened
- Outer
- oblique
- Ongoing
- overrated
- Organised
- Omniscient
- Open-minded
- Omnipresent
- Opinionated
- Oversized
- odorous
- Overwhelmed
- octagonal
- Obstinate
- Other
- Ornamental
- Open minded
- Optimal
- One
- otherworldly
- Optimist
- Oppressive
- Oafish
- Obliging
- Oddly
- Opportunistic
- Overzealous
- Overjoyed
- Oozy
- Oozing
- official
- obligatory
- Ocular
- Overpowered
- oscillating
- own
- often
- open minded
- obstructive
- Old-fashioned
- Odious
- Overprotective
- Ostensible
- obsequious
- oriental
- outspoken
- Opalescent
- olfactory
- Outward
The words in the list Adjective with O come from players of the word game Categories game.