1. A hard kind of stone;
    A form of silica more opaque than chalcedony (synset 114895229)
  2. A river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River (synset 109304451)
  3. A city in southeast central Michigan near Detroit;
    Automobile manufacturing (synset 109123290)
  1. Showing unfeeling resistance to tender feelings (synset 301161687)
    "his flinty gaze"; "the child's misery would move even the most obdurate heart"

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