底そこ意い地じ

noun

true character; underlying nature; inner feelings

Refers to a person's deep-seated disposition or real intentions, often hidden beneath the surface. Used in expressions like 底意地が悪い (spiteful, malicious) or 底意地を見抜く (see through someone's true nature).

• 彼かれの底そこ意い地じが悪わるいのは、もうみんな知しっている。

  Everyone already knows that he has a nasty streak.

• あの人ひとの底そこ意い地じを見み抜ぬくのは難むずかしい。

  It's hard to see through that person's true character.