deep-seeded

An incorrect expression for "firmly established" or "deeply ingrained."

Seeded is a synonym for "impregnated." Therefore, deep-seeded means "deeply impregnated."

The correct phrase, often confused with the mistaken similar form of "deep-seated", referring to an issue that has been long-borne inside of a person's spirit or soul and which may have serious recurrent consequences or impact upon their life.