'Unprofitable' in the Bible

Thus ye also, when ye shall have done all things that have been ordered you, say, We are unprofitable bondmen; we have done what it was our duty to do.

All have gone out of the way, they have together become unprofitable; there is not one that practises goodness, there is not so much as one:

But foolish questions, and genealogies, and strifes, and contentions about the law, shun; for they are unprofitable and vain.

Obey your leaders, and be submissive; for they watch over your souls as those that shall give account; that they may do this with joy, and not groaning, for this would be unprofitable for you.