AKAQARSIA (Galatians 5:19)

BDAG lists two senses for ἀκαθαρσία]:

(1) Lit., any substance that is filthy or dirty,
refuse.

For the nuance, "impurity," cp. Num. 19:13 with Mt.
23:27.

(2) Fig., a state of moral corruption, immorality,
vileness, esp. of sexual sins. See Rom. 1:24; 2 Cor.
12:21; Col. 3:5; Eph. 4:19; 5:3.

Moulton-Milligan (Vocabulary of the Greek Testament)
also has an interesting citation from POxy VIII.
1128.25 (A.D. 173):

PARADOTW TOUS TOPOUS KAQAROUS APO KOPRIWN KAI PASHS
AKAQARSIAS.

M-M also supplies this information:

"In a literal sense the noun [ἀκαθαρσία] occurs in a
formula used in agreements for renting houses, which
the tenant undertakes to leave in good condition"
(page 16)