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.).
Related Commentaries of 2 Kings 17:15
2 Kings 17:15
15 And they rejected his statutes, and his covenant that he made with their fathers, and his testimonies which he testified against them; and they followed vanity, and became vain, and went after the heathen that were round about them, concerning whom the LORD had charged them, that they should not do like them.