conundrum


Concise Oxford English Dictionary © 2008 Oxford University Press:
conundrum /kəˈnʌndrəm/
noun (pl. conundrums) a confusing and difficult problem or question.

■ a riddle.

– origin C16 (in the sense ‘a crank or pedant’): of unknown origin.
'conundrum' also found in these Oxford entries:

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