Secret

#533. Secret. -- N. secret; dead secret, profound secret; arcanum[obs], mystery; latency &c. 526; Asian mystery[obs]; sealed book, secrets of the prison house; le desous des cartes [Fr].
• enigma, riddle, puzzle, nut to crack, conundrum, charade, rebus, logogriph[obs]; monogram, anagram; Sphinx; crux criticorum[Lat].
• maze, labyrinth, Hyrcynian wood; intricacy, meander.
• problem &c. (question) 461; paradox &c. (difficulty) 704; unintelligibility &c. 519; terra incognita &c. (ignorance) 491.
• Adj. secret &c. (concealed) 528; involved &c, 248; labyrinthine, labyrinthian[obs], mazy.
• confidential; top secret.

This definition is from Roget's Thesaurus.
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