JMdict: 1275680

口が軽い 【くちがかるい】

  1. [exp,adj-i] having a loose tongue; being talkative; speaking without thinking; being unable to keep a secret
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
口 Mouth コウ, ク くち
軽 Lightly, Trifling, Unimportant ケイ, キョウ, キン かる.い, かろ.やか, かろ.んじる