Mystery describes something that is a secret, something where there is no clear explanation, something difficult to understand or explain or something unexplainable or unsolvable.
(noun)
- An example of a mystery is the location of your Christmas presents.
- An example of a mystery is whether there is proof that God exists.
- An example of a mystery is how exactly people came to be.
- An example of a mystery is a situation where it is unclear who committed a crime.