1. Conundrum WORD OF THE WEEK
Definition: a riddle, the answer to which involves a pun or play on words.
: an intricate and difficult problem
Example: What is black and white and read all over? A newspaper.

2. Word Origin and History s, Oxford University slang for "pedant," also "whim," etc., later (1790) "riddle, puzzle." Also spelled quonundrum. The sort of ponderous pseudo-Latin word that was once the height of humor in learned circles.

3. answer, explanation, solution
Part of Speech: noun
Antonyms:
answer, explanation, solution

4. Synonyms: closed book, riddle, mystery, enigma, puzzle, secret Sentence: How ancient people were able to build such massive structures without the benefit of today's knowledge and technology is a conundrum.

5. Examples: