flint

Adjective

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

Noun

• a city in southeast central Michigan near Detroit; automobile manufacturing

• a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River

• a hard kind of stone; a form of silica more opaque than chalcedony

Related words

• Synonyms: 
  flinty , granitic , obdurate , stony , Flint , Flint River