callous

Synonyms: apathetic blind to careless case-hardened cold cold-blooded deaf to hard hard-bitten hard-boiled hardened hardhearted heartless impassive impenitent indifferent indurated inflexible insensate insensible insensitive insentient inured obdurate soulless spiritless stiff stony stubborn thick-skinned torpid tough toughened unaffected unbending uncaring uncompassionate unconcerned unfeeling unimpressionable unresponsive unsusceptible unsympathetic

Antonyms: compassionate feeling kind nice sensitive sympathetic tender