Dreg :: Dreg (n.) Corrupt or defiling matter contained in a liquid, or precipitated from it; refuse; feculence; lees; grounds; sediment; hence, the vilest and most worthless part of anything; as, the dregs of society..
Dregginess :: Dregginess (n.) Fullness of dregs or lees; foulness; feculence.
Dreggish :: Dreggish (a.) Foul with lees; feculent.