O-2 - SIGNIFICANT PHRASES - FIFTEEN THOUSAND USEFUL PHRASES

oily and servile

old and decrepit

ominous and untrustworthy

omnivorous and sordid

oneness and unity

onerous and perplexing

open and inviting

opinions and hypotheses

opportunism and inconsistency

opposite and discordant

oppressed and sullen

optimistic and reassuring

opulence and magnitude

oracular and occult [oracular = solemnly prophetic; obscure]

order and uniformity

organic and rational

organization and system

origin and discovery

original and attractive

ornate and variegated

ostensible and explicit

ostentatiousness and gaiety

outlines and appearances

outrageous and scandalous

overburdened and confused

overcome and vanquish

overstep and contravene

overt and unmistakable

overwearied and outworn

overworked and fagged [fagged = worked to exhaustion]