conundrum Synonyms

enigma riddle brain-teaser puzzler thriller unsolved problem shocker jigsaw word game why twister tickler teaser stumper stickler sphinx self-contradiction secret antonymy Gordian knot tough proposition tough one knotty question difficult question puzzles braintwister brain-twister secrets brainteasers Riddles question mark brainteaser closed book whodunit koan roun riddled predicament inscrutableness inexplicability headache embroglio double-entendre dilemma difficulty cryptogram crux complication charade challenge