Clandestine vs Secret - What's the Difference?

something that should remain hidden from others (especially information that is not to be passed on)
information known only to a special group
something that baffles understanding and cannot be explained

not open or public; kept private or not revealed
communicated covertly
indulging only covertly
the next to highest level of official classification for documents
conducted with or marked by hidden aims or methods
(of information) given in confidence or in secret
designed to elude detection
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
not expressed
hidden from general view or use
not openly made known

"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"

"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"

"a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk"

"mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"

"a privy place to rest and think"; "a secluded romantic spot"; "a secret garden"

"the combination to the safe was a secret"; "he tried to keep his drinking a secret"

Adjective

Adjective, Noun