bred-in-the-bone

adjective2

1. •
   Firmly established or instilled; deep-seated.

   • They had the kind of bred-in-the-bone manners that were unobtrusively the same for one and all. — 1998
2. •
   Inveterate or habitual; long-standing.

   • Antrim, bred-in-the-bone Republican conservative, has a proud patriotic tradition. — 1982