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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.

Elsewhere in the Middle East, the negotiations' failure only seemed to guarantee more uncertainty.

From Barron's • Apr. 12, 2026

Besides, there was no transportation or any guarantee of protection.

From Los Angeles Times • Apr. 12, 2026

There is no guarantee, but there are things you can do to improve the odds that they’ll be hitting the links with you.

From The Wall Street Journal • Apr. 11, 2026

They do have the nine-point lead and there is no guarantee that City will win all of their games - or even beat the Gunners next weekend when the two sides meet.

From BBC • Apr. 11, 2026

“Then I guarantee you,” she said, “that they going to do their best to keep it from being their life. You mark my words.”

From "Go Tell It on the Mountain" by James Baldwin

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