What does the word conundrum mean?

Usage examples for conundrum

  1. There are those who would dismiss it carelessly, as making an appeal not far removed from that of the riddle and of the conundrum. – Inquiries and Opinions by Brander Matthews
  2. He was lounging back in his chair with an air of indolence rather too marked for a drawing- room, and staring at the ceiling with the expression of a man who has just been asked a conundrum. – The Diary of a Man of Fifty by Henry James