secret
adjective
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conducted with or marked by hidden aims or methodshugger-mugger
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indulging only covertly“a secret alcoholic”
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communicated covertly“their secret signal was a wink”
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(of information) given in confidence or in secretconfidential
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hidden from general view or useprivysecluded
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designed to elude detectionhidden
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not open or public
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not openly made known“a secret marriage”unavowed
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the next to highest level of official classification for documents
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having an import not apparent to the senses nor obvious to the intelligenceorphicmysteriousmysticmysticaloccult
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not expressed“secret (or private) thoughts”private
noun
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something that baffles understanding and cannot be explainedmysteryenigmaclosed book
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information known only to a special group“the secret of Cajun cooking”arcanum
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something that should remain hidden from others (especially information that is not to be passed on)“the combination to the safe was a secret”