Answer: filthier

AnswerCrossword Clue
FILTHIERMore soiled
filthier(of weather) Very unpleasant
filthierFILTHY, offensively dirty
filthierUsed to express one's anger and disgust
filthierDisgustingly dirty
filthierObscene and offensive
filthier(of a mood) Bad-tempered and aggressive