1.Definition: (of information) given in confidence or in secret

"Their secret communications"

Related Adjective(s):confidential

2.Definition: communicated covertly

"Their secret signal was a wink", "Secret messages"

3.Definition: conducted with or marked by hidden aims or methods

"Secret missions", "A secret agent", "Secret sales of arms"

Related Adjective(s):clandestine, surreptitious, undercover, underground

4.Definition: designed to elude detection

"A secret passage", "The secret compartment in the desk"

Related Adjective(s):hidden

5.Definition: having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding

"The secret learning of the ancients"

Related Adjective(s):mysterious, mystic, mystical, occult, orphic

6.Definition: hidden from general view or use

"A secret garden"

Related Adjective(s):privy, secluded

7.Definition: indulging only covertly

"A secret alcoholic"

8.Definition: not expressed

"Secret (or private) thoughts"

Related Adjective(s):private

9.Definition: not open or public; kept private or not revealed

"A secret formula", "Secret ingredients", "Secret talks"

10.Definition: not openly made known

"A secret marriage", "A secret bride"

Related Adjective(s):unavowed

11.Definition: the next to highest level of official classification for documents