gain·say 
/ˌgeɪnˈseɪ/ verb
gain·says /ˌgeɪnˈseɪ/ verb /ˌgeɪnˈseɪz, ˌgeɪnˈsɛz/; gain·said /ˌgeɪnˈseɪd, ˌgeɪnˈsɛd/; gain·say·ing [+ obj] formal : to deny or disagree with (something) : to show or say that (something) is not true — used in negative statements ▪ There is no gainsaying such evidence. [=the truth of such evidence cannot be denied]
