Showing unfeeling resistance to tender feelings.

synonyms: flint, flinty, obdurate, stony.

Roget 323: hard, rigid, stubborn, stiff, firm; starch, starched; stark, unbending, unlimber, unyielding; inflexible, tense; indurate, indurated; gritty, proof.    adamant, adamantine, adamantean^†; concrete, stony, granitic, calculous, lithic^†, vitreous; horny, corneous^†; bony; osseous, ossific^†; cartilaginous; hard as a rock etc. n.; stiff as buckram, stiff as a poker; stiff as starch, stiff as as board.    ... show more

Hard as granite:
— A granitic fist.

synonyms: granitelike, rocklike, stony.