口くちが悪わるい

expression, i-adjective

sharp-tongued; sarcastic; foul-mouthed

Describes a person whose way of speaking is harsh, cutting, or unkind. Often used for someone who habitually makes biting remarks.

See also: 口の悪い

• 彼かれは口くちが悪わるいけど、本ほん当とうは優やさしい人ひとだ。

  He has a sharp tongue, but he's actually a kind person.

• あの人ひとは口くちが悪わるいから、気きをつけたほうがいいよ。

  That person is sarcastic, so you'd better be careful.