'Useless' in the Bible

They profess to know God; but in their actions they disown Him, and are detestable and disobedient men, and for any good work are utterly useless.

But hold yourself aloof from foolish controversies and pedigrees and discussions and wrangling about the Law, for they are useless and vain.

And let our people too learn to set a good example in following honest occupations for the supply of their necessities, so that they may not live useless lives.