Source : Webster's Revised Unabridged Dictionary (1913)

Conundrum \Co*nun"drum\, n. [Origin unknown.]
   1. A kind of riddle based upon some fanciful or fantastic
      resemblance between things quite unlike; a puzzling
      question, of which the answer is or involves a pun.

            Or pun ambiguous, or conundrum quaint. --J. Philips.

   2. A question to which only a conjectural answer can be made.

            Do you think life is long enough to let me speculate
            on conundrums like that?              --W. Black.

Source : WordNet®

conundrum
     n : a difficult problem [syn: {riddle}, {enigma}, {brain-teaser}]