deep-rooted
adjective
Definitions
(literally, of a plant) Having deep roots; (of a non-living object) deeply and firmly embedded (in the ground, etc.).
Firmly established in thought or behaviour and difficult to change.
Example: They avoid conflict at all costs because of their deep-rooted fear of upsetting people.
Synonyms:bred-in-the-bonedeep-lyingdeep-seatedineradicable