Thesaurus.com
Dictionary.com
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.

Palantir’s months-long free customer pilots had no guarantee of a payoff, and it wasn’t uncommon for paying customers to cancel their contracts due to the high cost of Palantir’s products.

From MarketWatch • Apr. 4, 2026

The housing factory surety guarantee idea is “super innovative,” said Jan Lindenthal-Cox, chief investment officer at the San Francisco Housing Accelerator Fund, a nonprofit that directs philanthropic money toward cost-cutting affordable housing projects.

From Los Angeles Times • Apr. 3, 2026

While direct trade retaliation against the US has remained limited, there is no guarantee that pattern will hold, says economist Michael Pearce of Oxford Economics.

From BBC • Apr. 2, 2026

“We want a guarantee that this will never happen again.”

From The Wall Street Journal • Apr. 1, 2026

“Well, there’s no guarantee that there’ll be room for them when they arrive,” he said curtly.

From "The Secret History" by Donna Tartt

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.