Secret
Nouns
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secret
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dead secret, profound secret
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arcanum, mystery
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latency etc. Latency. Implication
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Asian mystery
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sealed book, secrets of the prison house
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riddle, puzzle, nut to crack, conundrum, charade, rebus, logogriph
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monogram, anagram
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Sphinx
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labyrinth, Hyrcynian wood
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intricacy, meander. problem etc. (question) Inquiry [Subject of Inquiry. Question]
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paradox etc. (difficulty) Difficulty
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unintelligibility etc. Unintelligibility
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terra incognita etc. (ignorance) Ignorance.