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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.

Instead, the Mets’ struggles will no doubt become a talking point in the upcoming labor negotiations as evidence from the players’ union that money alone isn’t enough to guarantee success.

From The Wall Street Journal • Apr. 20, 2026

The cases rely on the Constitution’s guarantee of due process before being deprived of life, liberty or property.

From Los Angeles Times • Apr. 19, 2026

Meanwhile, Hicham Harb's son Bilal al-Adra said the family considered his extradition illegal and with no guarantee of a fair trial.

From BBC • Apr. 17, 2026

Developing new medicines often takes years, sometimes decades, of experimentation, with no guarantee of success.

From MarketWatch • Apr. 15, 2026

If a caterpillar died before pupating, there was no guarantee they would be able to find that particular species again—or its host plant—in the riot of vegetation.

From "The Girl Who Drew Butterflies: How Maria Merian's Art Changed Science" by Joyce Sidman

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