Dictionary entry

ματαιότης

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ματαιότης, -ητος, ἡ

(< μάταιος), [in LXX for הֶבֶל, Ps 30 (31):638 (39):561 (62):9, al., and nearly 40 times in Ec; for שָׁוְא, Ps 25:4, al.; רִיק, etc.;]

vanity, emptiness, frailty, folly: Ro 8:20, II Pe 2:18; τ. νοός, Eph 4:17 (elsewhere only in Pollux, 6, 134, and Eccl.).†