JMdict: 2027320

脳天気 【のうてんき】

  1. [adj-na,n] laid-back; carefree; easygoing; thoughtless; happy-go-lucky
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
脳 Brain, Memory ノウ, ドウ のうずる
天 Heavens, Sky, Imperial テン あまつ, あめ, あま-
気 Spirit, Mind, Air, Atmosphere, Mood キ, ケ いき