くち かる
kuchiga karui

i-Adjective
Expression

1. having a loose tongue; being talkative; speaking without thinking; being unable to keep a secret

Related to 口の軽い Antonym of 口が堅い
あいつは くち かるいからこのことは わない ほうがいい。
aitsuwa kuchiga karuikara kono kotowa iwanai hōga ii.
Don't tell him. He's got a loose tongue.
Other forms: