A conundrum, in this esteemed committee's esteemed opinion, is a puzzle or riddle whose solution is not immediately apparent, much like the meaning of life.

Or, if you will, it's a fancy word for "that thing we're trying to figure out but keep putting off because, honestly, who needs adulting?"

Learn more about conundrums in our Conundrum 101 course Ask Bertrand another question (he's got a million of 'em)