gainsay
1 antonym for gainsay — opposites grouped by meaning.
Verb — To speak against something, or deny that it is true.
Antonyms
Etymology
From Middle English gainsayen, ȝeinseggen (“to say against, say in opposition to”), equivalent to gain- + say. Compare Old Danish gensige (“to speak against; gainsay”), Swedish gensaga (“a speaking against; protest”).
Full origin of gainsay →