What is a synonym for esoteric?

Here are some synonyms for "esoteric," depending on the specific nuance you're trying to convey:

General:

* Abstruse

* Arcane

* Obscure

* Recondite

* Secret

* Uncommon

* Unintelligible

* Mysterious

Focusing on knowledge or learning:

* Specialized

* Technical

* Academic

* Scholarly

Focusing on secrecy or exclusivity:

* Inner circle

* Exclusive

* Limited

* Private

* Confidential

Focusing on difficulty or complexity:

* Complicated

* Intricate

* Sophisticated

* Complex

* Deep

The best synonym will depend on the specific context in which you're using the word.