ματαιοσύνη
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
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.