口(くち)が軽(かる)い

くちがかるい
expression
loose-lipped, indiscreet
expression
1. loose-lipped, indiscreet, unable to keep secrets
Describes someone who easily reveals secrets or private information to others.
彼(かれ)は口(くち)が軽(かる)いから気(き)をつけて。
Be careful, he's loose-lipped.
口(くち)が軽(かる)い人(ひと)には大事(だいじ)な話(はなし)はできない。
You can't discuss important matters with someone who can't keep secrets.
お酒(さけ)を飲(の)むと口(くち)が軽(かる)くなる。
I become loose-lipped when I drink.
口(くち)が軽(かる)いと思(おも)われると、誰(だれ)も相談(そうだん)してくれなくなる。
If people think you're loose-lipped, no one will confide in you anymore.
秘密(ひみつ)だと言(い)ったのに、口(くち)の軽(かる)い友達(ともだち)がみんなに話(はな)してしまった。
Even though I said it was a secret, my loose-lipped friend told everyone.

Structure: 口(くち) (mouth) + が + 軽(かる)い (light). Literally 'one's mouth is light' - implying words come out easily.

Antonym: 口(くち)が堅(かた)い (tight-lipped, discreet)

Related words

Cultural note: In Japanese culture, keeping confidences is highly valued. Being called 口(くち)が軽(かる)い is quite negative.

Related Words

Antonym: 口(くち)が堅(かた)い (tight-lipped)
Related: お喋(しゃべ)り (talkative, chatterbox)
Compare: 口(くち)が滑(すべ)る (to let something slip)
Compare: 口(くち)が悪(わる)い (sharp-tongued)

Related Articles

Body-Part Idioms
core
Added 2026.1.18 19:03 · Revised 2026.9.4 21:31
06500/06884_kuchigakarui