hard+as+adamant
131unfeeling — I (New American Roget s College Thesaurus) adj. hard[ hearted], cold [ blooded], cruel; heartless, inhuman, callous, dispassionate; merciless, pitiless, unmerciful, relentless, adamant. See insensibility, malevolence. II (Roget s IV) modif. 1.… …
132unyielding — I (New American Roget s College Thesaurus) adj. immovable, unbending, rigid, inflexible, firm; grim, indomitable, obdurate, stubborn, obstinate, relentless, uncompromising; pertinacious, resolute; intractable, perverse. See hardness, obstinacy,… …
