conundrum Synonyms

enigma brain-teaser riddle antonymy word game jigsaw shocker thriller puzzler unsolved problem why twister tickler teaser stumper stickler sphinx Gordian knot koan tough proposition tough one knotty question difficult question puzzles braintwister brain-twister secrets brainteasers Riddles question mark brainteaser closed book whodunit self-contradiction secret maze labyrinth knot inscrutableness inexplicability headache embroglio dilemma difficulty cryptogram crux aporia antinomy anagram mesalliance