Synonyms of affirm in English:

affirm


See definition of affirm

verb

1‘he affirmed that they would lend military assistance’

SYNONYMS

declare, state, assert, aver, proclaim, pronounce, attest, swear, avow, vow, guarantee, promise, certify, pledge, give one's word, give an undertaking

rare asseverate

ANTONYMS

deny

2‘the charter affirmed the right of national minorities to use their own language’

SYNONYMS

uphold, support, defend, maintain, confirm, ratify, endorse, approve, approve of, agree to, consent to, assent to, sanction