骨子裡

骨子里
gǔzilǐ
beneath the surface; fundamentally; at the deepest level

CEDICT

deep down; at heart

Wiktionary

比喻內心深處。含有貶低的意思。

重編國語辭典

Entry Composition

1 骨子 gǔzi
  1. ribs
  2. frame
2 裡 lǐ
  1. lining
  2. interior
  3. inside
  4. internal
  5. also written 裏 lǐ