merciless - pitiless - cruel - heartless - brutal - callous - remorseless - unfeeling - unsparing - inhumane - savage - fierce - relentless - implacable - uncompassionate - unforgiving - unmerciful - cold-blooded - hard-hearted - iron-hearted - stone-hearted - harsh - severe - stern - grim - unrelenting - unyielding - ruthless
Ruthless describes a person who shows no compassion or mercy and is willing to cause harm or act harshly to achieve their goals. Such individuals are often seen as cold-blooded and can act without regard for others' feelings or consequences. This behavior is typically characterized by a lack of pity, empathy, or remorse.