1. (

• flinty ,
• flint ,
• granitic ,
• obdurate ,
• stony

) showing unfeeling resistance to tender feelings; "his flinty gaze"; "the child's misery would move even the most obdurate heart" ;

2. (

• granitic ,
• granitelike ,
• rocklike ,
• stony

) hard as granite; "a granitic fist" ;