deep-rooted

adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about deep-rooted at Wordnik → Where our words come from →

1. Of a plant, having deep roots.
2. Of a non-living object, deeply and firmly embedded (in the ground, etc.)
3. Firmly established in thought or behavior and difficult to change.

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