opinion, n. [belief], [judgment], impression; [decision], [ruling], [verdict], [sentence].
opium, n. Associated words: [narcotic], [opiate], chandoo, thebaine, narcotine, codeine, dope, meconism, meconology, meconophagism, meconophagist, opiophagism.
opponent, n. [adversary], [antagonist], [rival], [competitor].
opportune, a. [timely], [seasonable], apropos, felicitous, [appropriate].
oppose, v. [combat], [resist], confront, withstand, oppugn, impugn, [contend], antagonize, [contravene], discountenance, [gainsay], [contradict]. Antonyms: [yield], acquiesce, concur, [agree].
opposer, n. [opponent], [antagonist].
opposing, a. [conflicting], [antagonistic], contending, [opposite], adverse.
opposite, n. antithesis, counterpart, antipodes.
opposite, a. [contrary], adverse, diametrical, [antagonistic], inverse, [reverse], [contradictory], [counter], incompatible, antithetic, antipodal, [inconsistent].
opposition, n. [resistance], [counteraction], [hostility], [repulse], [rebuff], recalcitration, counterview, antagonism, [contradiction], [obstacle], [impediment], [obstruction]. Antonyms: acquiescence, non-resistance, concurrence, [agreement].