骨子里

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

CEDICT

deep down; at heart

Wiktionary

比喻内心深处。含有贬低的意思。

重編國語辭典

Entry Composition

1 骨子 gǔzi
  1. ribs
  2. frame
=2 里 lǐ variant of 里 lǐ
=2 里 lǐ
  1. lining
  2. interior
  3. inside
  4. internal
  5. also written 里 lǐ
=2 里 lǐ
  1. li, ancient measure of length, approx. 500 m
  2. neighborhood
  3. ancient administrative unit of 25 families
  4. (Tw) borough, administrative unit between the township 镇 zhèn and neighborhood 邻 lín levels