1. (verb)confirm, corroborate, sustain, substantiate, support, affirm establish or strengthen as with new evidence or facts Synonyms: actualise, realise, abide, embody, verify, get, support, stomach, defend, plunk for, hold up, substantiate, keep going, actualize, back, have, avow, fend for, patronise, stick out, assert, back up, keep, digest, nurture, keep up, corroborate, endorse, validate, reassert, hold, confirm, bear out, incarnate, affirm, swan, subscribe, brook, indorse, body forth, tolerate, suffer, endure, stand, aver, maintain, prolong, nourish, sustain, realize, patronize, underpin, plump for, patronage, put up, swear, bear
2. (verb)confirm, reassert strengthen or make more firm Synonyms: support, substantiate, confirm, reassert, sustain, affirm, corroborate
3. (verb)confirm make more firm Synonyms: support, substantiate, reassert, sustain, affirm, corroborate
4. (verb)confirm support a person for a position Synonyms: support, substantiate, reassert, sustain, affirm, corroborate
5. (verb)confirm administer the rite of confirmation to Synonyms: support, substantiate, reassert, sustain, affirm, corroborate
Synonyms, Thesaurus & Antonyms of 'confirm'
English Synonyms and Antonyms
1. confirm Confirm (L. con, together, and firmus, firm) is to add firmness or give stability to. Both confirm and corroborate presuppose something already existing to which the confirmation or corrobo Synonyms: confirm, assure, fix, sanction, substantiate, corroborate, prove, settle, sustain, establish, ratify, strengthen, uphold Antonyms: abrogate, cancel, overthrow, shatter, upset, annul, destroy, shake, unsettle, weaken, condole with, console
Synonyms for confirm 
