unsayable

un·say·a·ble

U0112200 (ŭn-sā′ə-bəl)adj. Not readily spoken or expressed: unsayable fears.

unsayable

(ʌnˈseɪəbəl) adjtoo insulting, indecent, etc, to be saidnsay the unsayable to express an opinion thought to be too controversial to mention