(mysteries)
Frequency: The word is one of the 3000 most common words in English.
1.
A ~ is something that is not understood or known about.
The source of the gunshots still remains a ~.
...the mysteries of mental breakdown.
N-COUNT
2.
If you talk about the ~ of someone or something, you are talking about how difficult they are to understand or know about, especially when this gives them a rather strange or magical quality.
She’s a lady of ~...
It is an elaborate ceremony, shrouded in ~.
N-UNCOUNT
3.
A ~ person or thing is one whose identity or nature is not known.
The ~ hero immediately alerted police after spotting a bomb.
...a ~ prize of up to ?1,000.
ADJ: ADJ n
4.
A ~ is a story in which strange things happen that are not explained until the end.
His fourth novel is a murder ~ set in London.
N-COUNT