1. • noun - something that should remain hidden from others (especially information that is not to be passed on)
   • noun - information known only to a special group
   • noun - something that baffles understanding and cannot be explained
   • adj - not open or public
   • adj - conducted with or marked by hidden aims or methods
   • adj - not openly made known
   • adj - communicated covertly
   • adj - not expressed
   • adj - designed to elude detection
   • adj - hidden from general view or use
   • adj - (of information) given in confidence or in secret
   • adj - indulging only covertly
   • adj - having an import not apparent to the senses nor obvious to the intelligence
   • adj - the next to highest level of official classification for documents
2. • Kept hidden from knowledge or view; concealed.
   • Dependably discreet.
   • Operating in a hidden or confidential manner: a secret agent.
   • Not expressed; inward: their secret thoughts.
   • Not frequented; secluded: wandered about the secret byways of Paris.
   • Known or shared only by the initiated: secret rites.
   • Beyond ordinary understanding; mysterious.
   • Containing information, the unauthorized disclosure of which poses a grave threat to national security.
   • Something kept hidden from others or known only to oneself or to a few.
   • Something that remains beyond understanding or explanation; a mystery.
   • These adjectives mean deliberately hidden from view or knowledge.
3. • adj - kept from knowledge or view
   • n - something kept from the knowledge of others

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