ἀγνοεῖν
From LSJ
οἵ γε καὶ ἐν τῷ παρόντι ἀντιπάλως μᾶλλον ἢ ὑποδεεστέρως τῷ ναυτικῷ ἀνθώρμουν → whose navy, even as it was, faced the Athenian more as an equal than as an inferior
Greek > English (Woodhouse Verbs Reversed)
(see also ἀγνοέω): be ignorant of, be ignorant, be unaware of, be unconscious of, have no idea, have no knowledge of, not to know, not to recognise
Lexicon Thucydideum
non agnoscere, not to recognize, 1.50.1, 2.48.3, 2.49.8, 4.96.3, 7.44.4,
ignorare, to not know, be ignorant, 5.68.2.