THESAURUS
contradict
abjure, abrogate, agree to disagree, annul, answer, answer conclusively, antagonize, argue down, assert the contrary, be antipathetic, be at cross-purposes, be contrary to, be inimical, be opposed to, beat against, belie, break, break off, brush aside, call into question, challenge, chuck, chuck out, clash, collide, conflict, conflict with, confound, confute, contemn, contest, contrapose, contrast with, contravene, controvert, counter, counteract, counterattack, counterbalance, countercheck, counterpoise, counterpose, countervail, counterwork, cross, crush, decline, defeat, demolish, deny, despise, differ, disaccord, disaffirm, disagree, disallow, disapprove, disavow, discard, disclaim, discount, disdain, dismiss, disown, dispose of, disprove, dispute, disregard, dissent, except, exclude, falsify, finish, floor, forbid, forswear, gainsay, garble, go against, go counter to, ignore, impugn, interfere with, jangle, jar, join issue upon, jostle, juxtapose in opposition, lock horns, meet head-on, militate against, mismatch, mismate, negate, negative, nonplus, not accept, not admit, nullify, object, offset, oppose, oppugn, overthrow, overturn, overwhelm, parry, pass by, pass up, play at cross-purposes, push aside, put to silence, rebuff, rebut, recant, reduce to silence, refuse, refuse to admit, refuse to consider, refute, reject, renounce, repel, repudiate, repulse, resist, retract, reverse, revoke, run against, run counter to, scout, set off, settle, shove away, shut up, silence, smash all opposition, spurn, squash, squelch, subvert, swim upstream, take back, take issue with, throw away, throw out, traverse, turn away, turn out, undermine, upset, vary, waive, work against
ROGET THESAURUS
contradict
Contrariety
VB
be contrary, contrast with, oppose, diller toto coelo, invert, reverse, turn the tables, turn topsy-turvy, turn end for end, turn upside down, turn inside out,
contradict, contravene, antagonize.
Opposition
VB
oppose, counteract, run counter to, withstand, control, hinder, antagonize, oppugn, fly in the face of, go dead against, kick against, fall afoul of, run afoul of, set against, pit against, face, confront, cope with, make a stand, make a dead set against, set oneself against, set one's face against, protest against, vote against, raise one's voice against, disfavor, turn one's back upon, set at naught, slap in the face, slam the door in one's face, be at cross purposes, play at cross purposes, counterwork, countermine, thwart, overthwart, work against, undermine, stem, breast, encounter, stem the tide, breast the tide, stem the current, stem the flood, buffet the waves, beat up against, make head against, grapple with, kick against the pricks, contend, do battle with, do battle against,
contradict, contravene, belie, go against, run against, beat against, militate against, come in conflict with, emulate, rival, spoil one's trade.
Counter Evidence
VB
countervail, oppose, mitigate against, rebut, subvert, cheek, weaken, contravene,
contradict, tell the other side of the story, tell another story, turn the scale, alter the case, turn the tables, cut both ways, prove a negative, audire alteram partem.
Dissent
VB
dissent, demur, call in question, differ in opinion, disagree, say no, refuse assent, refuse to admit, cavil, protest, raise one's voice against, repudiate,
contradict, have no notion of, differ toto caelo, revolt at, revolt from the idea, shake the head, shrug the shoulders, look askance, look askant, secede, recant.
Negation
VB
deny,
contradict, contravene, controvert, give denial to, gainsay, negative, shake the head, disown, disaffirm, disclaim, disavow, recant, revoke, dispute, impugn, traverse, rebut, join issue upon, bring in question, call in question, give the lie in his throat, give one the lie in his throat, deny flatly, deny peremptorily, deny emphatically, deny absolutely, deny wholly, deny entirely, give the lie to, belie, repudiate, set aside, ignore, rebut, qualify, refuse, recuse.