A primitive root; to be vain in act, word, or expectation; specifically to lead astray -- be (become, make) vain.
H1891. habal
הָבַל verb denominative act emptily, become vain —
Qal Jeremiah 2:5 = 2 Kings 17:15 they went after vanity וַיֶּהְבָּ֑לוּ and became vain, Psalm 62:11 אַלתֶּֿהְבָּ֑לוּ וּבְגָזֵל do not become vain (i.e. be demoralized) by robbery; with cognate accusative Job 27:12 תֶּהְבָּ֑לוּ הֶבֶל זֶה לָמָּה why do ye become vain with vanity (i.e. shew yourselves utterly vain) ?
Hiph`il cause to become vain Jeremiah 23:16 (of false prophets) אֶתְכֶם הֵמָּה מַהְבִּלִים i.e. fill you with vain hopes.