Synonyms of guarantee

guarantee 1 of 2

verb

1

as in to bond

to assume responsibility for the satisfactory quality or performance of

the shop will guarantee all work done on the car for 30 days

Synonyms & Similar Words

• bond
• assure
• guaranty
• certify
• pledge
• warrant
• contract
• undertake
• insist
• insure
• testify (to)
• vow
• attest
• stipulate
• declare
• swear
• adhere
• assert
• witness
• vouch (for)
• authenticate
• plight
• aver
• covenant
• avouch
• avow

2

as in to ensure

to make sure, certain, or safe

I can guarantee that you'll feel better after using my product for 30 days

Synonyms & Similar Words

• ensure
• assure
• secure
• insure
• guaranty
• ice
• promise
• cinch
• vouch
• certify
• warrant
• pledge
• witness
• swear
• attest

Antonyms & Near Antonyms

• undermine
• weaken
• enfeeble

3

as in to declare

to state clearly and strongly

I guarantee that this movie is better than the last one in the series

Synonyms & Similar Words

• declare
• assert
• announce
• proclaim
• profess
• say
• affirm
• explain
• justify
• lay down
• aver
• assure
• promote
• defend
• advertise
• avow
• emphasize
• convince
• avouch
• pronounce
• uphold
• stress
• publicize
• advance
• boost
• advocate
• persuade
• accent
• underline
• plug
• support
• underscore
• accentuate
• call
• reaffirm
• rationalize
• reassert
• espouse
• blaze
• champion

Antonyms & Near Antonyms

• minimize
• ignore
• disregard
• understate
• neglect
• overlook

guarantee

2 of 2

noun

ˌger-ən-ˈtē 

1

as in contract

a formal agreement to fulfill an obligation

the contractors gave us a written guarantee that the work on the house would be done by Christmas

Synonyms & Similar Words

• contract
• deal
• vow
• guaranty
• pledge
• assurance
• warranty
• bond
• surety
• treaty
• covenant
• pact
• oath
• bargain
• deposit
• seal
• convention
• insurance
• security
• compact
• word
• accord
• concordat
• bail
• troth
• pawn

2

as in pledge

something given or held to assure that the giver will keep a promise

you'll have to give your car keys as a guarantee that you'll come back

Synonyms & Similar Words

• pledge
• security
• promise
• guaranty
• assurance
• gage
• deposit
• pawn
• bond
• bail
• warranty
• contract
• commitment
• down payment
• surety
• oath
• earnest
• covenant
• compact
• word
• recognizance
• handsel
• troth

Example Sentences

Recent Examples of guarantee

Verb

Keep scrolling to shop 14 favorites that are guaranteed to fill your home with a little Christmas magic—all for under $100. — Kate Boswell, Southern Living, 7 Nov. 2026

The result might keep all three South Georgia region rivals in the top eight of the GHSA’s 7A Post Season Rankings standings, guaranteeing them home playoff games through the first two rounds of the 32-team draw. — Todd Holcomb, AJC.com, 7 Nov. 2026

Noun

There’s no guarantee Trump will notice or care about prediction markets this week. — Dan Bernstein, Sportico.com, 2 Nov. 2026

There’s no guarantee, however, that throwing more money at the problem will work. — Erik Hayden, HollywoodReporter, 2 Nov. 2026