Roget's Thesaurus

#533. Secret

Nouns

secret; dead secret, profound secret; arcanum, mystery; latency etc. 526; Asian mystery; sealed book, secrets of the prison house; le desous des cartes [Fr.]. enigma, riddle, puzzle, nut to crack, conundrum, charade, rebus, logogriph; monogram, anagram; Sphinx; crux criticorum [Lat.]. maze, labyrinth, Hyrcynian wood; intricacy, meander. problem etc. (question) 461; paradox etc. (difficulty) 704; unintelligibility etc. 519; terra incognita etc. (ignorance) 491.

Adjectives

secret etc. (concealed) 528; involved etc., 248; labyrinthine, labyrinthian, mazy. confidential; top secret.