Synonyms for Sixty-four dollar question:

• n.

  •brain-teaser (noun)
  • riddle.
  •enigma (noun)
  • cryptogram,
  • problem,
  • why,
  • twister,
  • conundrum,
  • cliffhanger,
  • mystification,
  • stickler,
  • perplexity,
  • puzzle,
  • puzzlement,
  • bewilderment,
  • parable,
  • Gordian Knot,
  • puzzler,
  • crux,
  • secret,
  • knot,
  • question.
  •riddle (noun)
  • embarrassment,
  • confusion,
  • complication,
  • plight,
  • intricacy,
  • doubt,
  • quandary,
  • complexity,
  • poser,
  • dilemma,
  • maze,
  • distraction,
  • entanglement,
  • predicament,
  • mystery,
  • charade,
  • strait.

• Other synonyms:

  •n.
  • closed book,
  • enigma,
  • grabber,
  • labyrinth,
  • question mark,
  • rebus,
  • sphinx,
  • sticker,
  • stumper,
  • teaser,
  • Rebuses,
  • teasers,
  • grabbers,
  • stickers,
  • brain-twister,
  • braintwister,
  • knotty question,
  • mindboggler,
  • sphinxes,
  • stumpers,
  • tough nut to crack,
  • tough proposition,
  • mind-boggler,
  • mind-twister.

Antonyms for Sixty-four dollar question:

• n.

  • riddle
    good fortune, solution, simplicity, confidence.