Synonyms and Antonyms of conundrum
something hard to understand or explain the conundrum of how an ancient people were able to build such massive structures without the benefit of today's knowledge and technology Synonyms closed book, mystery, enigma, head-scratcher, mystification, puzzle, puzzlement, riddle, secretRelated Words brainteaser, case, challenge, knot, matter, perplexity, poser, problem, stumper, trouble
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