Filth'i·ness noun 1. The state of being filthy. « Let us cleanse ourselves from all filthiness of the flesh and spirit.» 2 Cor. vii. 1. 2. That which is filthy, or makes filthy; foulness; nastiness; corruption; pollution; impurity. « Carry forth the ... Found on http://www.encyclo.co.uk/webster/F/29