Synonyms for attest Found 7 synonyms across 2 meanings for “attest”. provide evidence for (verb) certifymanifestdemonstrateevidence give testimony in a court of law (verb) testify Explore Related Words Rhymes with attestSynonyms for certifySynonyms for manifestSynonyms for demonstrateSynonyms for evidenceSynonyms for testify Synonym Finder | Rhyme Finder | Poetry Editor