1. (noun)flint a hard kind of stone; a form of silica more opaque than chalcedony Antonyms: softhearted, soft-boiled
2. (noun)Flint, Flint River a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River Antonyms: softhearted, soft-boiled
3. (adj)Flint a city in southeast central Michigan near Detroit; automobile manufacturing Antonyms: softhearted, soft-boiled