Strong’s Greek
G890 — achrestos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἄχρηστος
achrestos — pronounced 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
1 occurrence in the KJV.
Philemon 1:11
Which in time past was to thee unprofitable, but now profitable to thee and to me: