'Pretend' in the Bible

So Joab sent to Tekoa and took from there a wise woman, and he said to her, "Please pretend to mourn and put on garments of mourning. You should not anoint yourself [with] oil, and you must act like this woman who has been mourning over the dead for {a long time}.

On his lips, an enemy will pretend, but {inside} he will harbor deceit.