2 Kings 17:15

As idols are “vanity” and “nothingness,” mere weakness and impotence, so idolators are “vain” and impotent. Their energies have been wasted, their time misspent; they have missed the real object of their existence; their whole life has been a mistake; and the result is utter powerlessness. Literally, the word rendered “vanity” seems to mean “breath” or “vapor” - a familiar image for nonentity. It occurs frequently in the prophets, and especially in Jeremiah (e. g. Jeremiah 2:5; Jeremiah 8:19; Jeremiah 14:22, etc.).