Answer: flinty

AnswerCrossword Clue
FLINTYUnyielding
FLINTYStern and unyielding
FLINTYHard.
FLINTYObdurate
FLINTYHard and unyielding
FLINTYUnfeeling
FLINTYStony toward tender feelings
flintyresembling flint
flintycomposed of, containing, or resembling flint, esp. in hardness
flintyunyielding; unmerciful; obdurate