根深い

1. Origins, structure, and basic meaning

• Structure: 根深い is read as ねぶかい and is an い-adjective for a prejudice, conflict, or problem that is deeply rooted and hard to remove.
• Basic usage: It modifies a noun in 根深い偏見 and predicates a condition in 対立は根深い.

2. Common pitfalls and similar expressions

• Literal root and metaphor
  • The image of a deep root expresses a problem with long-standing causes that resist removal.
• Difference from 深い
  • 深い broadly means deep; 根深い specifically emphasizes entrenched causes and persistence.