From nabel; stupid; wicked (especially impious) -- fool(-ish, -ish man, -ish woman), vile person.
see HEBREW nabel
H5036. nabal
I. נָבָל adjective foolish, senseless, especially of the man who has no perception of ethical and religious claims, and with collateral idea of ignoble, disgraceful; — absolute ׳נ 2 Samuel 3:33 14t.; masculine plural נְבָלִים 13:13; Ezekiel 13:3 (ᵐ5 Co מִלִּבָּם); feminine plural נְבָלוֺת Job 2:10; — senseless, especially of religious and moral insensibility: נ ׳עַם Deuteronomy 32:6 (of Israel, unappreciative of J.'s benefits; opposed to חָכָם), so of heathen nation Psalm 74:18 (blaspheming name of ׳י), נ ׳גּוֺי Deuteronomy 32:21 ("" עָם לֹא); הַנּ ׳הַנְּבִאִים Ezekiel 13:3 (si vera lectio, see above); elsewhere as substantive (impious and presumptuous) fool, Isaiah 32:5 (opposed to נָדִיב noble-minded), characterized as at once irreligious and churlish, 32:6; denying God Psalm 14:1 = 53:2; insulting God 74:22, and God's servant 39:9; Proverbs 17:7 arrogant speech becometh not the (impious and presumptuous) fool (whose faults it only makes the more conspicuous), much less do lying lips him that this is noble (נדיב), 17:21 ("" כְּסִיל), 30:22 לחם ישׂבע כי ונבל (one of the things under which the earth trembles), נָבָל בְּנֵי Job 30:8 i.e. ignoble men ("" בְלִישֵֿׁם בְּנֵי); as one who might be expected to have a contumelious end, נ ׳הַכְּמוֺת אבנר ימות 2 Samuel 3:33 was Abner (destined) to die, as a ׳נ dieth ? of the man who amasses riches unjustly נבל יהיה ובאחריתו Jeremiah 17:11 i.e. will prove himself to be a ׳נ; as acting immorally (with collateral idea of disgracefully) 2 Samuel 13:13 בישׂראל הַנְּבָלִים כְּאַחַד תהיה ואתה (compare נְבָלָה); feminine only in הַנְּבָלוֺת אַחַת כְּדַבֵּר Job 2:10 (of Job's wife). compare DrDeuteronomy 22:21. 32, 6. 15.21; Psalt. 457.