Though wickedness be sweet in his mouth, though he hide it under his tongue;
Be - `taste sweet.' Sin's fascination is like poison, sweet to the taste, but at last deadly to the vital organs (Proverbs 20:17, "Bread of deceit is sweet to a man; but afterward his mouth shall be filled with gravel." Proverbs 9:17-18).
Hide ... tongue - seek to prolong the enjoyment by keeping the sweet morsel long in the mouth (so Job 20:13).