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ἀγνο-έω, Ep. ἀγνοι-, 3sg. subj. ἀγνοιῇσι Od.24.218: impf. ἠγνόουν Isoc.7.21, etc.: fut. ἀγνοήσω B.Fr.12, Isoc.12.251, D.32.10, 54.31: aor. ἠγνόησα A.Eu.134, Th.2.49, etc.; Ep. ἠγνοίησα Il.2.807, Hes.Th.551, Ep. contr. 3sg. ἀγνώσασκε Od.23.95: pf. ἠγνόηκα Pl. Sph.221d, Alex.20.4:—
Pass., fut. (of med. form) ἀγνοήσομαι D. 18.249; ἀγνοηθήσομαι v.l. in Luc.JTr.5: aor. ἠγνοήθην, v. infr.: pf. ἠγνόημαι Isoc.15.171, Pl.Lg.797a. (This Verb implies a form ἄγνοος, = ἀγνώς 11):—
not to perceive or recognize; Hom., almost always in aor., ἄνδρ' ἀγνοιήσασ' ὑλάει Od.20.15, cf. Th. l.c., Pl.Phdr. 228a; mostly with neg., οὐκ ἠγνοίησεν he perceived or knew well, Il. 2.807, etc.; μηδὲν ἀγνόει E.Andr.899.—
Mostly c. acc., to be ignorant of, Hdt.4.156, S.Tr.78; πάντα Pl.Smp.216d; ἑαυτοὺς ἀ. forget their former selves, D.10.74; τὴν πόλιν ἀ. not to discern the temper of the city, Id.19.231; τὸν ξένον Philostr. VA2.26; fail to understand, τὸ ῥῆμα Ev.Marc.9.32; περί τινος Pl.Phdr.277d: c. gen. pers. and rel. clause, ἀγνοοῦντες ἀλλήλων ὅ τι λέγομεν Id.Grg.517c: dependent clauses in part., τίς ..ἀ. τὸν ἐκεῖθεν πόλεμον δεῦρο ἥξοντα; D.1.15: with Conj., οὐδεὶς ἀ. ὅτι ..Id.21.156, etc.; ἀγνοῶν εἰ .. X.An.6.5.12:—
Pass., not to be known, recognized, Pl.Euthphr.4a, Hp.Ma. 294d, etc.; ἀγνοούμενα ὅπῃ ..ἀγαθά ἐστι Id.R.506a; ἠγνοῆσθαι ξύμπασιν ὅτι ..Id.Lg.797a; ὑπελάμβανον ἀγνοήσεσθαι D.18.249; καιρὸν οὐ παρεθέντα οὐδ' ἀγνοηθέντα ib.303, cf. Isoc.15.171; τὰ ἠγνοημένα unknown parts, Arr.An.7.1.4.

II. abs., go wrong, make a false step, first in Hp.Art.46, Antipho 5.44 (dub.l.), lsoc.8.39; part. ἀγνοῶν ignorantly, by mistake, X.An.7.3.38, Arist.EN1110b27; ἀγνοήσαντες And.4.5: in moral sense, to be ignorant of what is right, act amiss, Plb.5.11.5, cf. Ep.Heb.5.2:—
Med., fail to recognize, Gal.14.630.