FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

akathartos ἀκάθαρτος — ak-ath'-ar-tos — from 1 (as a negative particle) and a presumed derivative of 2508 (meaning cleansed); impure (ceremonially, morally (lewd) or specially, (demonic)):--foul, unclean.

see GREEK for 1

see GREEK for 2508