1. showing unfeeling resistance to tender feelings - his flinty gaze - the child's misery would move even the most obdurate heart • Syn: flinty, flint, obdurate, stony • Similar to: hardhearted, heartless • Derivationally related forms: stone (for: stony), granite 2. hard as granite - a granitic fist • Syn: granitelike, rocklike, stony • Similar to: hard • Derivationally related forms: granite