'Unprofitable' in the Bible

Should he reason with unprofitable talk, Or with speeches wherewith he can do no good?

And cast ye out the unprofitable servant into the outer darkness: there shall be the weeping and the gnashing of teeth.

Even so ye also, when ye shall have done all the things that are commanded you, say, We are unprofitable servants; we have done that which it was our duty to do.

They have all turned aside, they are together become unprofitable; There is none that doeth good, no, not, so much as one:

but shun foolish questionings, and genealogies, and strifes, and fightings about law; for they are unprofitable and vain.

who once was unprofitable to thee, but now is profitable to thee and to me:

Obey them that have the rule over you, and submit to them : for they watch in behalf of your souls, as they that shall give account; that they may do this with joy, and not with grief: for this were unprofitable for you.