口(くち)が軽(かる)い

くちがかるい
expression
loose-lipped, indiscreet
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、秘密(ひみつ)を話(はな)さないで。
Don't tell him secrets because 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.

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 EXPRESSIONS:

  • 口(くち)が滑(すべ)る (to let something slip, say something by mistake)
  • おしゃべり (talkative, chatterbox)
  • 口(くち)が悪(わる)い (to speak harshly, sharp-tongued) - different meaning

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)
core
Added 2026.1.18 19:03 · Revised 2026.1.19 21:17
06500/06884_kuchigakarui