μᾰταιόω,
bring to naught, [[Scholia 5th c.BC: Sophocles Tragicus “Trachiniae” 258, “Corpus Glossariorum Latinorum” ] Refs 5th c.BC+]
__2 ματαιοῦσιν ἑαυτοῖς ὅρασιν invent a vision of their own, [[ LXX.Jer.23.16. ] LXX]
__II more frequently in passive, to be brought to naught, οὐ ματαιωθήσεται τὰ ῥήματα[[LXX.Judg.6.4. ] LXX]
__II.2 become foolish, act foolishly, ἐματαιώθην σφόδρα[[LXX.1Ch.21.8, cf. NT.Rom.1.21 ] LXX+NT]; μεματαίωταί σοι thou hast done foolishly, [[ LXX.1Ki.13.13. ] LXX]