merciless Synonyms

unmerciful cruel pitiless ruthless savage remorseless barbarous vicious unsparing unrelenting vindictive unkindly vengeful unkind unfeeling tigerish uncompromising uncircumcised uncharitable unamiable tyrannous tyrannical wanton wreakful sadomasochistic uncaring stony-hearted stonyhearted unabated uncompassionate unsympathetic unsympathising inhumane unforgiving hard-boiled unyielding unpitying untamed unappeasable barbaric bare-knuckle heavy-handed sadistic unsympathizing stony stern grim flinty fierce fiendish