unmerciful Synonyms

merciless unsympathizing unkind unfeeling uncharitable tyrannous tigerish severe savage ruthless remorseless relentless pitiless unrelenting unsparing unsympathetic uncompassionate uncaring inhumane hardhearted compassionless unforgiving unapologetic barbaric unpitying unyielding vicious obdurate inclement cutthroat cruel cold-hearted cold-blooded cold callous brutish brutal bowelless bloody bloodthirsty demoniac ferocious fierce iron-fisted insensitive inhuman inexorable incompassionate implacable heartless