noun / adjective
mystery
MIS-tuh-ree/ˈmɪstəri/
Something puzzling or not yet understood.
The contents of the locked ornate box remain a mystery.

Etymology
A mystery was originally a sacred rite or doctrine known only to initiates. The word broadened from hidden religious truth to anything whose meaning, cause, or explanation remains unknown.
In context
others all i can say is that i knew god nameless unfathomable silent and yet near bestowing upon me in his bestowing himself upon me in the fullness of his mystery
More examples
- Scientists still study the mysteries of the deep ocean.
- A mystery guest joins us for dinner tonight.
- She reads a mystery on the train to work.
Forms
mystery · mysteries
mysterious adjective — Difficult to explain or identify.