Answer:

stoniest

Answer	Crossword Clue
STONIEST	Most unemotional
STONIEST	Maximally unfriendly
STONIEST	Hardest.

STONIEST	Most unfeeling
STONIEST	Least fit for farming
STONIEST	Most hard-hearted

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.