ingrained

Adjective

• (used especially of ideas or principles) deeply rooted; firmly fixed or held
  • deep-rooted prejudice
    
  • deep-seated differences of opinion
    
  • implanted convictions
    
  • ingrained habits of a lifetime
    
  • a deeply planted need
    

Related words

• Synonyms: 
  deep-rooted , deep-seated , implanted , planted