1. (noun) secret
something that should remain hidden from others (especially information that is not to be passed on)
Synonyms: enigma, closed book, mystery, arcanum
Antonyms: open, overt, acknowledged, exoteric, unconcealed, public, unclassified, outward
2. (noun) secret, arcanum
information known only to a special group
Synonyms: enigma, closed book, mystery, secret, arcanum
Antonyms: overt, public, acknowledged, unconcealed, outward, open, unclassified, exoteric
3. (adj) mystery, enigma, secret, closed book
something that baffles understanding and cannot be explained
Synonyms: arcanum, brain-teaser, whodunit, conundrum, riddle, secret, closed book, enigma, mystery, mystery story
Antonyms: open, unclassified, overt, public, outward, unconcealed, exoteric, acknowledged
4. (adj) secret
not open or public; kept private or not revealed
Synonyms: underground, occult, private, surreptitious, undercover, hugger-mugger, hush-hush, mysterious, mystic, hidden, privy, clandestine, secluded, cloak-and-dagger, orphic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: outward, overt, unclassified, public, unconcealed, open, acknowledged, exoteric
5. (adj) clandestine, cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground
conducted with or marked by hidden aims or methods
Antonyms: exoteric, unconcealed, overt, open, public, unclassified, outward, acknowledged
6. (adj) unavowed, secret
not openly made known
Synonyms: underground, occult, private, sneaking(a), surreptitious, orphic, undercover, hugger-mugger, hush-hush, mysterious, secret, hidden, privy, clandestine, secluded, cloak-and-dagger, mystic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: open, exoteric, overt, public, unconcealed, acknowledged, unclassified, outward
7. (adj) secret
communicated covertly
Synonyms: underground, occult, private, surreptitious, undercover, hugger-mugger, hush-hush, mysterious, mystic, hidden, privy, clandestine, secluded, cloak-and-dagger, orphic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: unconcealed, open, unclassified, acknowledged, outward, overt, public, exoteric
8. (adj) secret, private
not expressed
Synonyms: underground, occult, private, surreptitious, individual(a), undercover, hugger-mugger, hush-hush, secret, mysterious, mystic, hidden, privy, clandestine, secluded, cloak-and-dagger, orphic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: overt, open, unclassified, unconcealed, public, exoteric, acknowledged, outward
9. (adj) hidden, secret
designed to elude detection
Synonyms: underground, occult, private, surreptitious, orphic, undercover, confidential, hugger-mugger, hush-hush, mysterious, secret, hidden, privy, clandestine, secluded, cloak-and-dagger, mystic, unavowed, obscure, concealed, hole-and-corner(a), mystical, out of sight
Antonyms: outward, unconcealed, open, public, unclassified, overt, exoteric, acknowledged
10. (adj) privy, secluded, secret
hidden from general view or use
Synonyms: hole-and-corner(a), occult, sequestered, underground, orphic, privy(p), surreptitious, private, undercover, hugger-mugger, hush-hush, mysterious, secret, hidden, reclusive, privy, clandestine, secluded, cloak-and-dagger, mystic, unavowed, cloistered, confidential, mystical
Antonyms: acknowledged, overt, open, outward, public, exoteric, unconcealed, unclassified
11. (adj) confidential, secret
(of information) given in confidence or in secret
Synonyms: underground, occult, private, surreptitious, orphic, undercover, hugger-mugger, hush-hush, mysterious, secret, hidden, privy, clandestine, secluded, cloak-and-dagger, mystic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: unconcealed, acknowledged, public, overt, unclassified, exoteric, outward, open
12. (adj) secret
indulging only covertly
Synonyms: underground, occult, private, surreptitious, undercover, hugger-mugger, hush-hush, mysterious, mystic, hidden, privy, clandestine, secluded, cloak-and-dagger, orphic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: unclassified, public, unconcealed, outward, open, overt, acknowledged, exoteric
13. (adj) mysterious, mystic, mystical, occult, secret, orphic
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
Synonyms: hole-and-corner(a), occult, underground, unavowed, surreptitious, cryptical, mysterious, mystic, hidden, hush-hush, hugger-mugger, secret, deep, privy, clandestine, secluded, cloak-and-dagger, orphic, inscrutable, private, confidential, cryptic, undercover, mystifying, mystical
Antonyms: overt, unconcealed, public, exoteric, acknowledged, open, unclassified, outward
14. (adj) secret
the next to highest level of official classification for documents
Synonyms: underground, occult, private, surreptitious, undercover, hugger-mugger, hush-hush, mysterious, mystic, hidden, privy, clandestine, secluded, cloak-and-dagger, orphic, unavowed, confidential, hole-and-corner(a), mystical
Antonyms: open, overt, public, unconcealed, exoteric, acknowledged, outward, unclassified
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Synonyms and Antonyms of secret 
