Of or pertaining to stone, consisting of, or abounding in, stone or stones; resembling stone; hard; as, a stony tower; a stony cave; stony ground; a stony crust.
source: Webster 1913
adjective satellite
abounding in rocks or stones
Rocky fields. Stony ground. Bouldery beaches.
source: WordNet 3.0
showing unfeeling resistance to tender feelings
His flinty gaze. The child's misery would move even the most obdurate heart.