secret

Noun
  1. Something that should remain hidden from others (especially information that is not to be passed on) (synset 106685887)
    "the combination to the safe was a secret"; "he tried to keep his drinking a secret"
  2. Information known only to a special group (synset 106685698)
    "the secret of Cajun cooking"
  3. Something that baffles understanding and cannot be explained (synset 105693343)
    "how it got out is a mystery"; "it remains one of nature's secrets"
Adjective
  1. Not open or public;
    Kept private or not revealed (synset 302097082)
    "a secret formula"; "secret ingredients"; "secret talks"
  2. Conducted with or marked by hidden aims or methods (synset 301710918)
    "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"
  3. Not openly made known (synset 300029097)
    "a secret marriage"; "a secret bride"
  4. Communicated covertly (synset 301711857)
    "their secret signal was a wink"; "secret messages"
  5. Not expressed (synset 300955371)
    "secret (or private) thoughts"
  6. Designed to elude detection (synset 302096659)
    "a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk"
  7. Hidden from general view or use (synset 301866520)
    "a privy place to rest and think"; "a secluded romantic spot"; "a secret garden"
  8. (of information) given in confidence or in secret (synset 301865511)
    "this arrangement must be kept confidential"; "their secret communications"
  9. Indulging only covertly (synset 301711439)
    "a secret alcoholic"
  10. Having an import not apparent to the senses nor obvious to the intelligence;
    Beyond ordinary understanding (synset 300903364)
    "mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"
  11. The next to highest level of official classification for documents (synset 300417564)

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