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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.

“Pivot,” hosted by Kara Swisher and Scott Galloway, has no upfront guarantee but offers the hosts a generous cut of their show’s ad revenue.

From The Wall Street Journal • Apr. 15, 2026

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

From MarketWatch • Apr. 15, 2026

In 1971, the Supreme Court began to patch this hole in a case called Bivens, approving monetary damages against federal agents who violated the Fourth Amendment’s guarantee against unreasonable search and seizure.

From Slate • Apr. 15, 2026

Indoor events will have a standby line that does not require tickets; however, there is no guarantee you will be seated.

From Los Angeles Times • Apr. 15, 2026

The purpose was to keep the man’s focus and attention as sharp as possible, and to guarantee a solid night’s rest.

From "The Boy Who Harnessed the Wind" by William Kamkwamba

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