Synonyms of attest

1 Syllable
swears, meant, show, swear, seal
2 Syllables
confirms, quote, witness, swore, proven, warrant, prove, carding, aver, assert, bespeak, reassert, slotting, carded, uphold, sustain, display, support, tabbing, sware, retell, argue, confirm, affirm, slotted, affirms, confess
3 Syllables
certifying, exhibit, warranting, confirming, declaring, evincing, reasserted, protesting, importing, endorsing, testified, confessing, guaranteeing, ratify, testifying, asserted, verify, evinced, deponed, testify, confessed, affirming, countersign, bespoken, protested, depone, declare, asserting, affirmed, deponing, bespoke, adjure, certify, verifies, evince, certified, announce, tokened, reasserting
4 Syllables
notarize, substantiate, evidencing, evidenced, allegate, asservate, indicate, notarizing, indicating, demonstrate, notarized
5 Syllables
authenticating, corroborate, authenticated, authenticate