deep-seated

adjective2

1. •
   Physically located at a deep level.

   • a deep-seated tumour
   • Weaknesses in the earth’s crust allow deep-seated heat to rise nearer to the surface.
2. •
   (figurative) Firmly implanted or established in thought or behavior and difficult to change; deeply ingrained.

   • She has a deep-seated belief in the essential goodness of human nature.