FROM STRONG’S GREEK DICTIONARY (1890)

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

achrestos ἄχρηστος — akh'-race-tos — from 1 (as a negative particle) and 5543; inefficient, i.e. (by implication) detrimental:--unprofitable.

see GREEK for 1

see GREEK for 5543