This is the 4791st most frequent Japanese word.
気付か
"気付か" is not a complete word but stems from "気付く," meaning "to notice" or "to become aware."
Here, '気付か' is part of '気付かなかった', meaning 'did not notice,' highlighting awareness.
彼はその問題に気付かなかった。
He did not notice the problem.
In this sentence, '気付か' is part of '気付いた', meaning 'noticed,' showing realization or perception.
私は間違いにすぐ気付いた。
I immediately noticed the mistake.
Here, '気付か' is within '気付いていない', indicating 'not paying attention,' referring to lack of attention.