Enigma is a complex riddle or puzzle.
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How about a conundrum? Or an enigma.
Enigma most nearly means puzzle or riddle.
His disappearance is an enigma that has given rise to speculation
Enigma means: mystery: somebody or something that is not easily explained or understood.So the antonym would probably be something like the solution to a problem.
An enigma is a puzzle, or a situation that is perplexing, inexplicable, or ambiguous. Synonyms can be puzzle, riddle, mystery, question, or conundrum.