'Unprofitable' in the Bible

Reasoning with unprofitable talk, and with speeches which do no good?

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.