A primitive root; to pierce; to be hollow, or (figuratively) foolish -- hollow, vain.
H5014. nabab
[נָבַב] verb hollow out (compare Assyrian imbubu, flute, DlHWB 443, Late Hebrew אַבּוּב id., Aramaic אַבּוּבָא id.; hence also Arabic knots in reed, part of reed between knots, reed; see HoffmLCB 1882, 321 Frä23 Fl in LevyTW i. 417); —
Qal Passive participle נָבוּב Job 11:12; Jeremiah 52:21; נְבוּב Exodus 27:8; 38:7; — hollowed, hollow: of altar of tabernacle לֻחוֺת נְבוּב 27:8; 38:7 (P); of pillar in temple Jeremiah 52:21; figurative נָבוּב אִישׁ Job 11:12, i.e. empty, hollow-minded man.
נֹ֫בֶה see נֹב.