λαθών

From LSJ

νοεῖν γάρ ἐστι κρεῖττον καὶ σιγὴν ἔχειν → it's better, you see, to understand and yet say nothing (Menander)

Source

French (Bailly abrégé)

part. ao.2 de λανθάνω.

Russian (Dvoretsky)

λαθών: part. aor. 2 к λανθάνω.