Answer:

harshest

Answer	Crossword Clue
HARSHEST	Most severe
HARSHEST	Least lenient
HARSHEST	Most scathing

HARSHEST	Most grating
HARSHEST	Least forgiving
HARSHEST	Most trying

Crossword

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