usage: not openly made known; "a secret marriage"; "a secret bride"
4. secret, covert (vs. overt)
usage: communicated covertly; "their secret signal was a wink"; "secret messages"
5. secret, private, inward (vs. outward)
usage: not expressed; "secret (or private) thoughts"
6. hidden, secret, concealed (vs. unconcealed)
usage: designed to elude detection; "a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk"
7. privy, secluded, secret, private (vs. public)
usage: hidden from general view or use; "a privy place to rest and think"; "a secluded romantic spot"; "a secret garden"
8. confidential, secret, private (vs. public)
usage: (of information) given in confidence or in secret; "this arrangement must be kept confidential"; "their secret communications"
9. secret, covert (vs. overt)
usage: indulging only covertly; "a secret alcoholic"
usage: having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding; "mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"
11. secret, classified (vs. unclassified)
usage: the next to highest level of official classification for documents