enigma
1. something that baffles understanding and cannot be explained (Freq. 1) - how it got out is a mystery - it remains one of nature's secrets • Syn: mystery, secret, closed book • Derivationally related forms: enigmatic, enigmatical, mysterious (for: mystery), mystify (for: mystery) • Hypernyms: perplexity 2. a difficult problem • Syn: riddle, conundrum, brain-teaser • Derivationally related forms: riddle (for: riddle) • Hypernyms: problem
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