(n.) One who, or that which, puzzles; a difficult or inexplicable question or fact.

Chinese puzzle Gordian knot Holy Willie Joseph Surface Mawworm Pecksniff Pharisee Tartuffe affecter attitudinarian attitudinizer baffling problem blagueur bluff bluffer brain twister canter canting hypocrite charlatan crossword puzzle crux dilemma dissembler dissimulator enigma enigmatic question fake faker floorer formalist fourflusher fraud humbug hypocrite impersonator impostor jigsaw puzzle knot knotty point lip server lip worshiper malingerer mind-boggler mountebank mystery node nodus nonplus nut to crack oxymoron paradox perplexed question perplexity pharisee phony pietist pious fraud pons asinorum poseur posture maker posturer posturist pretender problem puzzle puzzlement puzzler quack quacksalver quackster quandary question question mark ranter religionist religious hypocrite ringer saltimbanco sham shammer sixty-four dollar question sniveler snuffler spiritual humbug sticker striker of poses stumper teaser tough proposition vexed question whited sepulcher why