adjective

1. (literally, of a plant) Having deep roots; (of a non-living object) deeply and firmly embedded (in the ground, etc.).

2. Firmly established in thought or behaviour and difficult to change.

   “They avoid conflict at all costs because of their deep-rooted fear of upsetting people.”

Synonyms: bred-in-the-bone, deep-lying, deep-seated, ineradicable