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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.

Some companies guarantee they will get your loan forgiven — but experts say that’s not a promise any legitimate company can deliver on.

From MarketWatch • Apr. 30, 2026

It could sometimes guarantee funding up to eight years in advance.

From BBC • Apr. 28, 2026

Discovery deal over the finish line, billionaire Larry Ellison agreed to guarantee the entire $47.2 billion in equity needed.

From Los Angeles Times • Apr. 28, 2026

Meanwhile other countries are asking whether the pharmaceutical industry would have the capacity and motivation to contribute to a global pandemic agreement "without a guarantee of return on investment", she said.

From Barron's • Apr. 27, 2026

“I know. And you’ll be the best damn one, man. I guarantee it.”

From "We Were Here" by Matt De La Peña

Vocabulary lists containing guarantee

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Frindle

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