IRREVEALABLY

\ɪɹɪvˈiːləblɪ], \ɪɹɪvˈiːləblɪ], \ɪ_ɹ_ɪ_v_ˈiː_l_ə_b_l_ɪ]\
Sort: Oldest first
 
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.