Meaning of the word ingrained in English

What does ingrained mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

ingrained

US /ɪnˈɡreɪnd/
UK /ɪnˈɡreɪnd/

Adjective

firmly fixed or established and difficult to change

Example:
The belief that hard work leads to success is deeply ingrained in his mind.
It's difficult to change habits that are so deeply ingrained.