Synonyms of the word

nullify

• v. (transitive, law) to make legally invalid.
• v. to prevent from happening.

annul

• v. (transitive) To formally revoke the validity of.
• v. (transitive) To dissolve (a marital union) on the grounds that it is not valid.

avoid

• v. (transitive) To keep away from; to keep clear of; to endeavor not to meet; to shun; to abstain from.
• v. (transitive, obsolete) To make empty; to clear.
• v. (transitive, now law) To make void, to annul; to refute (especially a contract).
• v. (transitive, law) To defeat or evade; to invalidate. Thus, in a replication, the plaintiff may deny the…
• v. (transitive, obsolete) To emit or throw out; to void.
• v. (transitive, obsolete) To leave, evacuate; to leave as empty, to withdraw or come away from.
• v. (transitive, obsolete) To get rid of.
• v. (intransitive, obsolete) To retire; to withdraw, depart, go away.
• v. (intransitive, obsolete) To become void or vacant.

cancel

• v. (transitive) To cross out something with lines etc.
• v. (transitive) To invalidate or annul something.
• v. (transitive) To mark something (such as a used postage stamp) so that it can't be reused.
• v. (transitive) To offset or equalize something.
• v. (transitive, mathematics) To remove a common factor from both the numerator and denominator of a fraction,…
• v. (transitive, media) To stop production of a programme.
• v. (printing, dated) To suppress or omit; to strike out, as matter in type.
• v. (obsolete) To shut out, as with a railing or with latticework; to exclude.
• v. (slang) To kill.
• n. A cancellation (US); (nonstandard in some kinds of English).
• n. (obsolete) An enclosure; a boundary; a limit.
• n. (printing) The suppression on striking out of matter in type, or of a printed page or pages.

contradict

• v. (obsolete) To speak against; to forbid.
• v. To deny the truth of (a statement or statements).
• v. To make a statement denying the truth of the statement(s) made by (a person).
• v. To be contrary to; to oppose; to resist.

invalidate

• v. To make invalid. Especially applied to contract law.

negate

• v. To deny the existence, evidence, or truth of; to contradict.
• v. To nullify or cause to be ineffective.
• v. To be negative; bring or cause negative results.
• v. (computing) To perform the NOT operation on.

neutralise

• v. To make inactive or ineffective.

neutralize

• v. (American) Alternative spelling of neutralise.

quash

• v. To defeat forcibly.
• v. To crush or dash to pieces.
• v. (law) To void or suppress (a subpoena, decision, etc.).

void

• adj. Containing nothing; empty; vacant; not occupied; not filled.
• adj. Having no incumbent; unoccupied; said of offices etc.
• adj. Being without; destitute; devoid.
• adj. Not producing any effect; ineffectual; vain.
• adj. Of no legal force or effect, incapable of confirmation or ratification.
• adj. Containing no immaterial quality; destitute of mind or soul.
• adj. (computing, programming, of a function or method) That does not return a value.
• n. An empty space; a vacuum.
• n. (astronomy) An extended region of space containing no galaxies.
• n. (materials science) A collection of adjacent vacancies inside a crystal lattice.
• n. (fluid mechanics) A pocket of vapour inside a fluid flow, created by cavitation.
• v. (transitive) To make invalid or worthless.
• v. (transitive, medicine) To empty.
• v. To throw or send out; to evacuate; to emit; to discharge.
• v. (intransitive, obsolete) To withdraw, depart.
• v. (transitive, obsolete) To remove the contents of; to make or leave vacant or empty; to quit; to leave.
• n. (now rare, historical) A voidee.

weaken

• v. (transitive) To make weaker.
• v. (intransitive) To become weaker.