gainsay
verb /ˌɡeɪnˈseɪ/
  /ˌɡeɪnˈseɪ/
 often used in negative sentences (formal)Verb Forms
| present simple I / you / we / they gainsay |  /ˌɡeɪnˈseɪ/  /ˌɡeɪnˈseɪ/ | 
| he / she / it gainsays |  /ˌɡeɪnˈsez/  /ˌɡeɪnˈsez/ | 
| past simple gainsaid |  /ˌɡeɪnˈsed/  /ˌɡeɪnˈsed/ | 
| past participle gainsaid |  /ˌɡeɪnˈsed/  /ˌɡeɪnˈsed/ | 
| -ing form gainsaying |  /ˌɡeɪnˈseɪɪŋ/  /ˌɡeɪnˈseɪɪŋ/ | 
- gainsay something to say that something is not true; to disagree with or deny something synonym deny- Nobody can gainsay his claims.
- There is no gainsaying these facts.
 Word OriginMiddle English: from obsolete gain- ‘against’ + say.