unmerciful Synonyms

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