1. (verb) invalidate, annul, quash, void, avoid, nullify
declare invalid
Synonyms: ward off, empty, fend off, keep off, avoid, quash, keep down, neutralize, annul, overturn, lift, neutralise, head off, nullify, deflect, stave off, rescind, subjugate, evacuate, reduce, avert, vitiate, repeal, invalidate, debar, forefend, negate, forfend, reverse, obviate, revoke, vacate, subdue, cancel, void, countermand, repress
Antonyms: formalize, validate, formalise
2. (verb) cancel, invalidate
make invalid for use
Synonyms: set off, void, nullify, vitiate, scrub, cancel, annul, avoid, scratch, strike down, quash, invalidate, call off, delete, offset
Antonyms: validate, formalise, formalize
3. (verb) invalidate, nullify
show to be invalid
Synonyms: neutralise, void, nullify, vitiate, neutralize, annul, avoid, cancel, invalidate, negate, quash
Antonyms: validate, formalise, formalize
4. (verb) invalidate, void, vitiate
take away the legal force of or render ineffective
Synonyms: impair, debase, pervert, spoil, avoid, deprave, debauch, empty, annul, vitiate, subvert, evacuate, profane, deflower, invalidate, cancel, misdirect, demoralise, mar, nullify, quash, corrupt, demoralize, void
Antonyms: validate, formalize, formalise
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Synonyms and Antonyms of invalidate 
