clandestine
clandestine [ klan-DES-tin ] [ adjective ] MEANING : 1. done secretly or under cover 2. surreptitious 3. characterized by secrecy USAGE EXAMPLE 1 : She told the detective that she suspected her husband of having a clandestine extramarital affair. USAGE EXAMPLE 2 : I have an interest in clandestine operations in WWII because my uncle, whilst and Englishman, was assigned to the Royal Norwegian Navy in WWII.