Synonyms of confirm

confirm

verb

kən-ˈfərm 

1

as in to verify

to give evidence or testimony to the truth or factualness of

several eyewitnesses who can confirm the defendant's account of what happened

Synonyms & Similar Words

• verify
• argue
• support
• validate
• corroborate
• prove
• certify
• vindicate
• attest
• authenticate
• demonstrate
• bear out
• substantiate
• witness
• affirm
• establish
• reinforce
• testify (to)
• guarantee
• declare
• document
• assert
• vouch (for)
• back (up)
• warrant
• profess
• aver
• avouch
• avow
• reenforce

Antonyms & Near Antonyms

• refute
• disprove
• rebut
• deny
• contradict
• question
• challenge
• gainsay
• dispute
• disclaim
• disavow
• contest

2

as in to approve

to give official acceptance of as satisfactory

the senate must confirm an appointment to an ambassadorship

Synonyms & Similar Words

• approve
• ratify
• finalize
• accept
• endorse
• authorize
• acknowledge
• okay
• sign
• formalize
• sanction
• OK
• warrant
• affirm
• clear
• validate
• accredit
• certify
• initial
• homologate
• approbate
• bless
• enable
• indorse
• permit
• allow
• pass
• sanctify
• license
• legalize
• canonize
• sign off (on)
• rubber-stamp
• reapprove
• licence

Antonyms & Near Antonyms

• deny
• reject
• negative
• disapprove
• decline
• disallow
• veto
• prohibit
• turn down
• forbid
• ignore
• enjoin
• ban
• proscribe
• disregard
• refuse
• neglect
• overlook
• rebut
• interdict
• illegalize
• spurn
• rebuff

Synonym Chooser

How does the verb confirm contrast with its synonyms?

Some common synonyms of confirm are authenticate, corroborate, substantiate, validate, and verify. While all these words mean "to attest to the truth or validity of something," confirm implies the removing of doubts by an authoritative statement or indisputable fact.

confirmed the reports

When is authenticate a more appropriate choice than confirm?

While the synonyms authenticate and confirm are close in meaning, authenticate implies establishing genuineness by adducing legal or official documents or expert opinion.

handwriting experts authenticated the diaries

When is it sensible to use corroborate instead of confirm?

While in some cases nearly identical to confirm, corroborate suggests the strengthening of what is already partly established.

witnesses corroborated his story

When could substantiate be used to replace confirm?

The synonyms substantiate and confirm are sometimes interchangeable, but substantiate implies the offering of evidence that sustains the contention.

the claims have yet to be substantiated

In what contexts can validate take the place of confirm?

The meanings of validate and confirm largely overlap; however, validate implies establishing validity by authoritative affirmation or by factual proof.

validated the hypothesis by experiments

When would verify be a good substitute for confirm?

In some situations, the words verify and confirm are roughly equivalent. However, verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at.

all statements of fact in the article have been verified

Example Sentences

Recent Examples of confirm

Four days later, Conejos County Coroner Richard Martin confirmed to PEOPLE that the two died after being struck by lightning. —David Chiu, PEOPLE, 20 Oct. 2025

Estefanía Mondragón, executive director of PODER of Idaho, told the Idaho Statesman that her organization had members at the scene who said Immigration and Customs Enforcement agents were there, and the FBI release confirmed that. —Sally Krutzig, Idaho Statesman, 20 Oct. 2025

However, authorities later confirmed that the federal government was not involved. —James Factora, Them., 20 Oct. 2025

Simpson and Johnson, who were married for a decade, separated in January, Simpson's reps confirmed in a statement to USA TODAY at the time. —Anna Kaufman, USA Today, 20 Oct. 2025