3. CONFIRM Synonyms: 94 Similar and Opposite Words - Merriam-Webster
Link: https://www.merriam-webster.com/thesaurus/confirm
Description: WEBSynonyms for CONFIRM: verify, argue, support, validate, corroborate, prove, certify, vindicate; Antonyms of CONFIRM: refute, disprove, rebut, deny, contradict, question, challenge, gainsay