adj. & adv.
adj. (filthier, filthiest) 1 extremely or disgustingly dirty. 2 obscene. 3 colloq. (of weather) very unpleasant. 4 vile.
adv. 1 filthily (filthy dirty). 2 colloq. extremely (filthy rich). filthy lucre 1 dishonourable gain (Tit. 1:11). 2 joc. money. filthily adv. filthiness n.