奥深い

1. Origins, structure, and basic meaning

• Structure: 奥深い, read おくぶかい, denotes depth and richness of meaning or knowledge that rewards continued exploration.
• Basic usage: It describes deep meaning in a short poem and the increasing depth found in the world of cooking.

2. Common pitfalls and similar expressions

• Depth rather than mere difficulty
  • Rather than merely saying something is difficult, it positively suggests many layers of meaning or knowledge to explore.