bowelless callous coldhearted cruel disagreeable dog-eat-dog flinty hard hard-boiled hardhearted harsh heartless ill inclement inexorable inhospitable merciless obdurate pitiless relentless remorseless ruthless unaffectionate unamiable unbenign unbenignant uncompassioned uncordial unemotional unfeeling unforgiving ungenial ungracious unkind unkindly unloving unmerciful unpitiful unpitying unremorseful unsympathetic unsympathizing unyielding without mercy