Strong's #890: achrestos (pronounced akh'-race-tos)
from 1 (as a negative particle) and 5543; inefficient, i.e. (by implication) detrimental:--unprofitable.
Thayer's Greek Lexicon:
̓́
achrēstos
1) useless, unprofitable
Part of Speech: adjective
Relation: from G1 (as a negative particle) and G5543
Usage:
This word is used 1 times:
Philemon 1:11: "Which in time past was to thee unprofitable, but now profitable to thee"