King James Bible

FLINT'Y, adjective

1. Consisting of flint; as a flinty rock.

2. Like flint; very hard, not impressible; as a flinty heart.

3. Cruel; unmerciful; inexorable.

4. Full of flint stones, as flinty ground.

Flinty-slate, a mineral of two kinds, the common and the Lydian stone.