What are some insults that begin with the letter O?

Answer 1

oaf

obese

objectionable

oblivious (aka "clueless")

obscene

obsequious

obsessed

obsolete

obstructionist

obtuse

obnoxious

obstinate

odious

odoriferous

"off"

offish

offensive

officious

ogre

oily

old

old-fashioned

onanistic (aka "wanker")

onerous

opaque (as opposed to transparent or open)

opportunistic (when used to imply one is taking advantage of someone)

oppressive

ornery

orthodox (when used to imply inflexibility, lack of imagination, or old-fashioned)

orwellian (in reference to the dystopian societies described by George Orwell)

oscillating (when referring to someone who vacillates or flip-flops)

ossified (similar to suggesting someone is a fossil or unable to change)

ototoxic (damaging to the ears - a nasty thing to say about a speaker or singer)

outclassed

oudated

outlandish

outre

outspoken

overambitious

overanxious (you worry too much...)

overbearing

overblown (not as cool as you think you are)

overbold

overcautious

overconfident

overcredulous (what a sucker!)

overcritical

overcurious (aka nosy)

overdelicate (wimp)

overdone

overdressed

overemotional

overenthusiastic

overexcited

overfamiliar (too chummy)

overfed (fat)

overgrown

overheated

overmodest

overreaching

overripe (ever heard of soap?)

oversexed (horn-dog, nympho)

overstuffeed

overzealous