- Enigma
- Inexplicable event
- Something that can't be explained
- Something unexplained
- Unsolved crime
- A profound secret; something wholly unknown, or something
kept cautiously concealed, and therefore exciting curiosity or wonder;
something which has not been or can not be explained; hence,
specifically, that which is beyond human comprehension.
- A kind of secret religious celebration, to which none were
admitted except those who had been initiated by certain preparatory
ceremonies; -- usually plural; as, the Eleusinian mysteries.
- A poser
- Brain-teaser
- Clever conundrum
- Conundrum
- Enigma
- Large meshed sieve
- Mystery pepper with slugs
- Baffling question
- Difficult problem
- Difficult question
- Enigma
- Poser
- Problem or puzzle
- Riddle
- American soldier joining Mensa is excited to get puzzles
- Mysteries
- Riddles
- Things that are mysterious or difficult to understand
- Things that puzzle
- of Enigma