filthy

adj. (-ier, -iest) 1 extremely or disgustingly dirty. 2 obscene. 3 colloq. (of weather) very unpleasant. adv. 1 filthily (filthy dirty). 2 colloq. Extremely (filthy rich).  filthily adv. Filthiness n.

superl. Defiled with filth, whether material or moral; nasty; dirty; polluted; foul; impure; obscene.