Answer: harshest

AnswerCrossword Clue
HARSHESTMost severe
HARSHESTLeast lenient
HARSHESTMost scathing
HARSHESTMost grating
HARSHESTLeast forgiving
HARSHESTMost trying
harshest(of reality or a fact) Grim and unpalatable
harshestHaving an undesirably strong effect
harshestCruel or severe
harshestUnpleasantly rough or jarring to the senses
harshest(of a climate or conditions) Difficult to survive in; hostile
harshestHARSH, severe (harsh)