ματαιοποιός
From LSJ
Τούτῳ τῷ λόγῳ χρήσαιτο ἄν τις ἐπ' ἐκείνων τῶν ἀνθρώπων οἳ παραδόξως ἀλαζονεύονται, μηδὲ τὰ κοινὰ τοῖς ἀνθρώποις ἐπιτελεῖν δυνάμενοι → One would use this fable for those who give themselves unreasonable airs, but can't handle everyday life (Aesop 40)
English (LSJ)
όν,
A acting foolishly, Ath.5.179f.
Greek (Liddell-Scott)
μᾰταιοποιός: -όν, ὁ ποιῶν ἢ πράττων ἀνοήτως ἢ ἀπερισκέπτως, Ἀθήν. 179F.