arcane ar-KAYN adjective WS #4

known or understood by very few people; mysterious, secret, or obscure

1. The professor's lecture on quantum mechanics was filled with arcane concepts that left many students confused.
2. She had an arcane knowledge of ancient rituals that fascinated her peers.
3. The legal document was written in arcane language that required an expert's interpretation.
4. Only a few scholars could understand the arcane symbols in the ancient manuscript.
5. He prided himself on his arcane collection of rare first editions.