Vocabulary

riddle; puzzle; enigma; mystery

noun
N3 freq #14

Example sentences

He had no difficulty in explaining the mystery.

It is still a mystery why he suddenly left the town.

It is a mystery why he quit his job.

It is a mystery why he did not finish the poem.

No one could solve the puzzle.

The cause of the accident is a complete mystery.

We never got a clear explanation of the mystery.

No one has succeeded in solving the mystery.