devilish Play adjectiveLike or appropriate to a devil in evil and cruelty.adverbVery; extremely. SYNONYMS abhorrentabominableaccursedamoralappallingatrociousawfulbarbaricbarbarousbestialblackblack-heartedbrutishcacodemoniccrueldamnabledarkdepraveddespicabledreadfulegregiousevilfacinorousflagitiousfoulghastlyheinoushideoushorriblehorrifyingimmoraliniquitousloathsomemonstrousnefariousodiouspervertedsavageshamefulshockingsinfulterribleungodlyunspeakableviciousvilevillainouswicked