Deep-rooted (adjective)

Having roots that are firmly established deeply in the ground; having a long-standing and firmly established foundation.

Origin:

From the combination of the adverb "deep" meaning "in a deep or profound manner" and the past participle of the verb "root" meaning "to establish deeply or firmly".

Examples:

1. The tree had deep-rooted roots.
2. The problem was deep-rooted and difficult to solve.
3. The tradition was deep-rooted in the culture.
4. The prejudice was deep-rooted and hard to change.
5. The belief was deep-rooted and passed down through generations.