Answer: stoniest

AnswerCrossword Clue
STONIESTMost unemotional
STONIESTMaximally unfriendly
STONIESTHardest.
STONIESTMost unfeeling
STONIESTLeast fit for farming
STONIESTMost hard-hearted
stoniestpetrifying; stupefying
stoniesthaving a stone or stones, as fruit
stoniestSTONY, abounding in small rocks, also STONEY
stoniestresembling or characteristic of stone, esp. in hardness
stoniestmotionless or rigid
stoniestunfeeling; merciless; obdurate
stoniestfull of or pertaining to stones or rock