unpitying unrelenting strict merciless harsh unforgiving cruel relentless rigid stony-hearted unbending inexorable unyielding hardhearted implacable unappeasable cold-blooded inhumane sever heartless uncompassionate pitiless unmerciful ruthless stern
vile mortal evil sinful serious felonious bad wicked grave criminal villainous nefarious heinous
unjustifiable inexcusable irreparable irremediable unpardonable unforgivable