口くちが軽かるい

expression, i-adjective

loose-tongued; talkative; unable to keep a secret

Describes someone who speaks too freely, often revealing secrets or saying things without thinking. The antonym is 口が堅い (tight-lipped).

See also: 口の軽い

Antonyms: 口が堅い

• 彼かれは口くちが軽かるいから、大だい事じな話はなしはしないほうがいい。

  He has a loose tongue, so you'd better not tell him anything important.