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