底そこ意い地じが悪わるい

expression, i-adjective

malicious at heart; spiteful; wicked

Describes a person whose underlying nature is mean-spirited or ill-natured, often hidden beneath a surface appearance. Used as a set phrase.

• 彼かれは底そこ意い地じが悪わるいから、あまり信しん用ようしないほうがいい。

  He is malicious at heart, so you'd better not trust him too much.

• あの人ひとの底そこ意い地じの悪わるさには驚おどろかされる。

  I'm amazed at how spiteful that person is deep down.