puzzle

puzzle

noun

Definition of PUZZLE

something hard to understand or explain <the final fate of the colonists at Roanoke remains a puzzle to this very day>

Synonyms closed book, conundrum, enigma, head-scratcher, mystification, puzzle, puzzlement, riddle, secret

Related Words brainteaser, case, challenge, knot, matter, perplexity, poser, problem, stumper, trouble