Quick Definition
ματαιόω v. I become vain
Strong's Definition
from 3152; to render (passively, become) foolish, i.e. (morally) wicked or (specially), idolatrous
KJV Usage: become vain
UBS Dictionary of the Greek New Testament
verb | ματαιολογία · ματαιολόγος · μάταιος · ματαιότης · μάτην
65.38 · (ματαιόομαι) · Value · Useful, Useless
to become futile, to become worthless, to become nonsense to become useless and hence worthless
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ματαιόω: (μάταιος); 1 aor. pass. ἐματαιώθην; to make emply, vain, foolish: ἐματαιώθησαν ev τοῖς διαλογισμοῖς αὐτῶν, were brought to folly in their thoughts, i. e. fell into error, Ro. i. 21. (2 K. xvii. 15; Jer. ii. 5; 1 Chr. xxi. 8; [etc.]; nowhere in Grk. auth.)
Mounce Concise Greek Dictionary
ματαιόω mataioō 1x
to make vain; from the Hebrew, pass. to fall into religious error, to be perverted, Rom. 1:21*
Abbott-Smith Greek Lexicon
† ματαιόω, -ῶ
(< μάταιος), [in LXX: IV Ki 17:15, Je 2:5, al. הבל, etc.;]
to make vain, foolish: Ro 1:21.†
Liddell-Scott-Jones — Greek-English Lexicon
ματαιόω (mataioō) — to make futile. μᾰταιόω, bring to naught, [Refs 5th c.BC+]
2. ματαιοῦσιν ἑαυτοῖς ὅρασιν invent a vision of their own, [LXX]
II. more frequently in passive, to be brought to naught, οὐ ματαιωθήσεται τὰ ῥήματα[LXX]
II.2. become foolish, act foolishly, ἐματαιώθην σφόδρα[LXX+NT]; μεματαίωταί σοι thou hast done foolishly, [LXX]