What is a synonym for mysterious?

Here are some synonyms for "mysterious", depending on the specific nuance you want to convey:

General synonyms:

* Enigmatic

* Inscrutable

* Puzzling

* Perplexing

* Unfathomable

* Obscure

* Arcane

* Cryptic

* Secret

* Hidden

* Unclear

* Ambiguous

More specific synonyms:

* Intriguing: suggesting a mystery that is captivating or fascinating.

* Eerie: suggesting a mystery that is unsettling or spooky.

* Abstruse: suggesting a mystery that is very difficult to understand.

* Unexplained: suggesting a mystery that is without a clear answer.

* Uncanny: suggesting a mystery that is strange and unsettling.

The best synonym for "mysterious" will depend on the specific context in which you are using the word.