Deep-seated (adjective)

1. Firmly established and difficult to remove or change.
2. Originating from a fundamental and persistent cause.

Origin:

The term 'deep-seated' was first used in the mid-16th century and is formed by combining the adjectives 'deep' and 'seated'.

Examples:

1. He had deep-seated fears about going to the dentist.
2. The deep-seated hatred between the two families was evident in their interactions.
3. She had a deep-seated passion for music from a young age.
4. The deep-seated corruption in the government was exposed in a recent investigation.
5. The deep-seated issues in their relationship needed to be addressed.