Dictionary / Vocabulary / 上の空
うわのそら
inattention; absent-mindedness
Also written うわの空
彼は授業中上の空だった。
He had his head in the clouds in class.
私は彼の言うことを上の空で聞いていた。
While he was talking, I guess I was absent-minded.
君はいつもうわの空だ。
You are always hearing but not listening.