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attest has 7 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
“His high fever attested to his illness”
authenticate, affirm to be true, genuine, or correct, as in an official capacity
“I attest this signature”
give testimony in a court of law
establish or verify the usage of
“This word is not attested until 1993”
Synonyms, antonyms and the broader and narrower relations for attest come from Princeton University’s WordNet. Full sources and licences.