flint definition

1. a hard kind of stone; a form of silica more opaque than chalcedony
2. a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River
3. a city in southeast central Michigan near Detroit; automobile manufacturing
4. showing unfeeling resistance to tender feelings
• examples: his flinty gaze
• examples: the child's misery would move even the most obdurate heart