Strong's G890 — ἄχρηστος (adjective)
achrestos (akh'-race-tos) adj.
1. inefficient
2. (by implication) detrimental
[from G1 (as a negative particle) and G5543]
KJV: unprofitable 
Root(s): G1, G5543 
Hebrew root: χρηστός
Occurrences: 1