'Undesirable' in the Bible

Saul and the people spared Agag and the best of the sheep, the oxen, the fatlings, the lambs, and everything that was good, and they were not willing to destroy them entirely; but everything that was undesirable or worthless they destroyed completely.

“Does the ear not put words to the test,Just as the palate tastes its food [distinguishing between the desirable and the undesirable]?