ἀγνοέω
Etym. from Ἄγνοος ῀ ἀγνώς
I. Passive "not to perceive or know", ἄνδρ᾽ ἀγνοιήσασ᾽ from "not recognising" him, Od.: mostly with negat., οὐκ ἠγνοίησεν, i. e. "he perceived or knew well", Il.; μηδὲν ἀγνόει "learn all", Eur.: —c. acc. "to be ignorant of", Hdt., attic; ἀγν. περί τινος Plat.; dependent clauses are added in part., τίς ἀγνοεῖ τὸν πόλεμον ἥξοντα; Dem.; or with a Conjunct., οὐδεὶς ἀγνοεῖ ὅτι.., id=Dem.; Pass. "not to be known", Plat., etc.
II. absol. "to go wrong, make a false step", etc.; ἀγνοῶν "ignorantly, by mistake", Xen.