(adj): vs. unconcealed) -- (hidden on any grounds for any motive
(adj): prenominal), hugger-mugger, hush-hush, secret, surreptitious, undercover, underground -- (conducted with or marked by hidden aims or methods
(adj): vs. overt) -- (secret or hidden; not openly practiced or engaged in or shown or avowed
(adj): not openly made known
(adj): vs. acknowledged) -- (not recognized or admitted
(adj): communicated covertly
(adj): vs. overt) -- (secret or hidden; not openly practiced or engaged in or shown or avowed
(adj): not expressed
(adj): vs. outward) -- (relating to or existing in the mind or thoughts
(adj): designed to elude detection
(adj): vs. unconcealed) -- (hidden on any grounds for any motive
(adj): hidden from general view or use
(adj): vs. public) -- (confined to particular persons or groups or providing privacy
(adj): (of information) given in confidence or in secret
(adj): vs. public) -- (confined to particular persons or groups or providing privacy
(adj): indulging only covertly
(adj): vs. overt) -- (secret or hidden; not openly practiced or engaged in or shown or avowed
(adj): having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
(adj): vs. exoteric) -- (confined to and understandable by only an enlightened inner circle
(adj): the next to highest level of official classification for documents
(adj): vs. unclassified) -- (official classification of information or documents; withheld from general circulation
(n): something that should remain hidden from others (especially information that is not to be passed on)
(n): a message received and understood
(n): information known only to a special group
(n): a message received and understood
(n): something that baffles understanding and cannot be explained
(n): trouble or confusion resulting from complexity
Daffynition: something that you only tell one person at a time.