What is another word for assure?

Common synonyms for assure include ensure, see, insure, worry, reassure.

What is the opposite of assure?

Antonyms of assure include doubt, disquiet, alarm, unsettle, discourage.

Synonyms for

Assure

Verb / ʌˈʃʊr / Another word for assure — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

to make someone confident or certain about something

Synonyms & similar words

ensure see insure worry reassure seetoit secure guarantee tell promise control check ascertain guarantee promise certify convince reassure affirm pledge swear vouch warrant ensure justify verify declare avow assert proclaim attest confirm insure

Synonyms by register

Formal

guarantee certify affirm confirm

Informal

tell promise reassure make sure

Literary

vouch pledge promise

Antonyms

doubt disquiet alarm unsettle discourage distrust worry

Common collocations

assure someone of
assure yourself that
assure the public
assure success
assure safety
assure a good result
assure a place

Word family

noun assurance

verb assure

adjective assured

adverb assuredly

Usage note

Assure is typically used when making someone feel certain or confident about something. It is often followed by 'that' or 'of'. Avoid using 'assure' to mean 'ensure' or 'insure'.