conundrum
/kəˈnʌndrəm/
noun
- A confusing or difficult problem or question.
- She faced the conundrum of choosing between two equally good job offers.
- The budget deficit presented a real conundrum for the city council.
- Scientists are trying to solve the conundrum of dark matter.
- A riddle or puzzle, especially one with a pun or trick answer.
- "What has keys but can't open locks?" is a classic conundrum.
- The children laughed at the silly conundrum about a talking dog.
- The old book was full of conundrums that stumped the readers.