Strong's G255 — ἀλυσιτελής (adjective)
alusiteles (al-oo-sit-el-ace') adj.
1. unprofitable, gainless
2. (by implication) exceedingly injurious, malicious, destructive, or deadly
[from G1 (as a negative particle) and the base of G3081]
KJV: unprofitable 
Root(s): G1, G3081 
Hebrew root: λυσιτελεῖ
Occurrences: 1