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Definition of invalidate : To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.

Synonyms:

lift, acquittal, debase, pervert, reduce, award, deprave, null, set aside, ward off, keep down, vacate, forefend, demoralize, evacuate, subjugate, roll back, continue, deflower, subdue, mar, keep off, charge, disabuse, rescind, demoralise, disannul, empty, stave off, fend off, discredit, obviate, deflect, corrupt, bring in a verdict, countermand, avert, scratch, void, debar, avoid, strike down, bar, offset, citation, neutralise, repress, call off, explode, set off, quash, subvert, spoil, head off, debauch, call for, abate, deflate, confound, acquit, annihilate, scrub, forfend, profane, debunk, misdirect

delete, efface, divorce, eradicate, dismiss, reject, disavow, extinguish, eliminate, nullify, retract, disaffirm, veto, refute, abnegate, neutralize, deny, withdraw, obliterate, destroy, cancel, abolish, repudiate, revoke, negate, undo, disclaim, annul, dissolve

cripple, hinder, handicap, impair, hamper, screw up, dull, incapacitate, hobble, prostrate, stupefy, disarm, vitiate, scotch, anesthetize, paralyze, deaden, weaken, sap, disable, cramp, benumb, stun, tamper, lame, undermine, enfeeble, botch, hamstring

counterwork, invert, counterbalance, check, overturn, reverse, renounce

confute, dispute, abrogate, repeal, disprove, conflict, challenge, rejoin, contradict, rebut

Usage examples:

• That such frequently occur, there is no doubt; and with respect to them, I have merely to observe, that they do not in the slightest degree invalidate the correctness of my conclusions. - "Remarks on the Subject of Lactation", Edward Morton.
• Nevertheless, anything confirmatory of that hypothesis would, pro tanto, invalidate the present. - "The Ethnology of the British Islands", Robert Gordon Latham.
• The only ground in support of the Ephraimitic Shiloh- the fact, namely, that Shiloh, wherever else it occurs in the Old Testament, always signifies the name of the place- we hope to invalidate by and by; when it will be seen that the town received its name only on the ground of the passage now under consideration. - "Christology of the Old Testament: And a Commentary on the Messianic Predictions, v. 1", Ernst Wilhelm Hengstenberg.