空気くうき
kūki

Noun

1. air; atmosphere

空気くうきおと媒体ばいたいだ。
kūkiwa otono baitaida.
The air is a medium for sound.
Noun

2. mood; situation

Related to 空気を読む
Noun
Idiomatic Expression

3. someone with no presence; someone who doesn't stand out at all

Colloquial