ματαιοσύνη
From LSJ
εἰ γάρ κεν καὶ σμικρὸν ἐπὶ σμικρῷ καταθεῖο καὶ θαμὰ τοῦτ᾽ ἔρδοις, τάχα κεν μέγα καὶ τὸ γένοιτο → for if you add only a little to a little and do this often, soon that little will become great (Hesiod W&D, 361-362)
English (LSJ)
ἡ, A = ματαιότης, Polem.Phgn.13, al.
Greek (Liddell-Scott)
μᾰταιοσύνη: ἡ, = ματαιότης, Πολέμωνος Φυσιογν. 1. 6, Ἀδαμάντ. 1. 5.
Greek Monolingual
ματαιοσύνη, ἡ (Α) μάταιος
η ματαιότητα.