ASSERT Synonyms: 97 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/assert
WebSynonyms for ASSERT: declare, affirm, proclaim, profess, say, announce, guarantee, explain; Antonyms of ASSERT: minimize, ignore, disregard, understate, overlook, neglect, deny, abandon.
DA: 22 PA: 35 MOZ Rank: 60