- 1(often used in negative sentences) to say that something is not true; to disagree with or deny something synonym deny
- 2 Nobody can gainsay his claims.
NAmE//ˌɡeɪnˈseɪ//, NAmE//ˈɡeɪnseɪ//gainsay something(formal)Verb Forms present simple I / you / we / they gainsay
he / she / it gainsays
past simple gainsaid
-ing form gainsaying