enigma

Noun
  1. Something that baffles understanding and cannot be explained (synset 105693343)
    "how it got out is a mystery"; "it remains one of nature's secrets"
    is a type of: perplexity - trouble or confusion resulting from complexity
    same as: closed book, mystery, secret
  2. A difficult problem (synset 106798080)
    is a type of: problem - a question raised for consideration or solution
    same as: brain-teaser, conundrum, riddle

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