THESAURUS
invalidate
abate, abolish, abrogate, annihilate, annul, belie, blow sky-high, blow up, bring to naught, bring to nothing, buffer, cancel, cancel out, come to nothing, counterbalance, countermand, counterorder, deflate, disannul, disconfirm, discredit, disprove, disqualify, do away with, explode, expose, frustrate, make void, negate, negativate, negative, neutralize, nullify, offset, override, overrule, prove the contrary, puncture, quash, recall, recant, renege, repeal, rescind, retract, reverse, revoke, set aside, show up, stultify, suspend, thwart, undercut, undo, unfit, vacate, vitiate, void, waive, withdraw, write off
ROGET THESAURUS
invalidate
Impotence
VB
be impotent, not have a leg to stand on, vouloir rompre l'anguille au genou, vouloir prendre la lune avec les dents, collapse, faint, swoon, fall into a swoon, drop, go by the board, go by the wayside, go up in smoke, end in smoke, render powerless, deprive of power, disable, disenable, disarm, incapacitate, disqualify, unfit,
invalidate, deaden, cramp, tie the hands, double up, prostrate, paralyze, muzzle, cripple, becripple, maim, lame, hamstring, draw the teeth of, throttle, strangle, garrotte, garrote, ratten, silence, sprain, clip the wings of, put hors de combat, spike the guns, take the wind out of one's sails, scotch the snake, put a spoke in one's wheel, break the neck, break the back, unhinge, unfit, put out of gear, unman, unnerve, enervate, emasculate, castrate, geld, alter, neuter, sterilize, fix, shatter, exhaust, weaken.
Undueness
VB
be undue, not be due, infringe, encroach, trench on, exact, arrogate, arrogate to oneself, give an inch and take an ell, stretch a point, strain a point, usurp, violate, do violence to, disfranchise, disentitle, disqualify,
invalidate, relax, misbehave, misbecome.
Confutation
VB
confute, refute, disprove, parry, negative, controvert, rebut, confound, disconfirm, redargue, expose, show the fallacy of, defeat, demolish, break, overthrow, overturn scatter to the winds, explode,
invalidate, silence, put to silence, reduce to silence, clinch an argument, clinch a question, give one a setdown, stop the mouth, shut up, have, have on the hip, not leave a leg to stand on, cut the ground from under one's feet, be confuted, fail, expose one's weak point, show one's weak point, counter evidence.