enigma
1.
(
noun
) something that baffles understanding and cannot be explained; "how it got out is a mystery"; "it remains one of nature's secrets"
Synonyms:
closed book
,
mystery
,
secret
Related Words:
perplexity
2.
(
noun
) a difficult problem
Synonyms:
brain-teaser
,
conundrum
,
riddle
Related Words:
problem
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