Answer:

stonier

AnswerCrossword Clue
STONIERLess expressive
STONIERLess sympathetic
STONIERLess likely to gush
STONIERMore obdurate
STONIERMore hardhearted.
STONIERMore flinty.
STONIERMore unfeeling.
STONIERHarder.
STONIERMore hard-hearted
STONIERMore unyielding
STONIERMore pitiless
STONIERMore unfeeling
STONIERMore poker-faced
STONIERNot as warm
STONIERLess emotional
STONIERHarder to till, in a way
STONIERMore straight-faced