Mark 9:32ἠγνόουν
But they did not understand this statement, and they were afraid to ask Him about it.
Luke 9:45ἠγνόουν
But they did not understand this statement. It was veiled from them so that they could not comprehend it, and they were afraid to ask Him about it.
Acts 17:23ἀγνοοῦντες
For as I walked around and examined your objects of worship, I even found an altar with this inscription: TO AN UNKNOWN GOD. Therefore what you worship as something unknown, I now proclaim to you.
Romans 1:13ἀγνοεῖν
I do not want you to be unaware, brothers, how often I planned to come to you (but have been prevented from visiting until now), in order that I might have a harvest among you, just as I have had among the other Gentiles.
1 Corinthians 10:1ἀγνοεῖν
I do not want you to be unaware, brothers, that our forefathers were all under the cloud, and that they all passed through the sea.
2 Corinthians 1:8ἀγνοεῖν
We do not want you to be unaware, brothers, of the hardships we encountered in the province of Asia. We were under a burden far beyond our ability to endure, so that we despaired even of life.

Abbott-Smith

ἀγνοέω, -ῶ (> ἁγνίζω),
[in LXX for שָׁגָה, שָׁגַג, אָשַׁם, etc. ;]

1. to be ignorant, not to know: absol., Ι Ti 1:13, Heb.5:2; with accusative, Act.13:27 17:23, Rom.10:3, 2Co.2:11; ἐν οἷς, 2Pe.2:12; before ὅτι, Rom.2:4 6:3 7:1, 1Co.14:38; οὐ θέλω ὑμᾶς ἀγνοεῖν, a Pauline phrase: with accusative, Rom.11:25; before ὑπέρ, 2Co.1:8; περί, 1Co.12:1, 1Th.4:13. ὅτι, Rom.1:13, 1Co.10:1 (for similar usage in π., V. MM, VGT, see word). Pass.: 1Co.14:38, 2Co.6:9, Gal.1:22.

2. not to understand: with accusative, Mrk.9:32, Luk.9:45.
† (AS)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.