'Unprofitable' in the Bible

Should he reason with unprofitable talk, or with speeches with which he can do no good?

The burden of the animals of the South. Through the land of trouble and anguish, of the lioness and the lion, the viper and fiery flying serpent, they carry their riches on the shoulders of young donkeys, and their treasures on the humps of camels, to an unprofitable people.