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Definitions

guarantee

[gar-uhn-tee] / ˌgær ənˈti /
NOUN
pledge, promise
Synonyms
STRONGEST
agreement assurance certificate collateral contract deposit insurance security warranty
STRONG
attestation bail bargain bond certainty certification charter covenant earnest gage guaranty lock oath pawn pipe recognizance surety testament token undertaking vow warrant word
WEAK
sure thing word of honor
Antonyms
STRONGEST
disagreement uncertainty
STRONG
breach break
VERB
pledge, promise
Synonyms
STRONGEST
assure ensure insure maintain protect prove secure support
STRONG
affirm angel attest aver back bankroll certify confirm cosign endorse evidence evince grubstake guaranty juice mortgage reassure stake swear testify wager warrant witness
WEAK
answer for be surety for bind oneself get behind give bond make bail make certain make sure pick up the check pick up the tab sign for stand behind stand up for vouch for
Antonyms
STRONGEST
harm hurt injure let go neglect
STRONG
contradict deny discourage disprove invalidate oppose refute reject repudiate veto
WEAK
break

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But having a diploma on the wall is no guarantee of your lawyer’s competence or ethics.

From MarketWatch • Apr. 24, 2026

She said there were MPs willing to take the same bill on during the next session should they be successful in the private members' bill ballot, which can guarantee debating time on Friday sittings.

From BBC • Apr. 23, 2026

He added that “attacking a national landmark fits the idea of a fame-seeking attack. Picking a symbolic target is a way to almost guarantee yourself more attention.”

From Los Angeles Times • Apr. 21, 2026

But the national association of mobile network operators said on Monday that they can no longer guarantee uninterrupted services, citing fuel shortages.

From Barron's • Apr. 21, 2026

There was one way I could guarantee he’d lose.

From "Glitch" by Laura Martin

Vocabulary lists containing guarantee

Declaration of the Rights of Woman (1791)

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Frindle

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"The Constitution"

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