Pediculosis: a state of lousiness, or the abnormal condition caused by the multiplication of lice on the body: sec phthiriasis.
I had not known a bath during all the time I was on the Somme and lousiness was part and parcel of my make-up.
Thus, we have Pediculid (the source of lousiness), Philopterid, and Liotheid.
Bad; nasty; crummy: Crab was all she ever did. What a lousy sport/ Yuh lousy boob (1690+)
: I did pretty lousy on that test