clan·des·tine 
/klænˈdɛstən/ adjective
/klænˈdɛstən/ adjective formal : done in a private place or way : done secretly
▪ a clandestine [=secret] meeting ▪ a clandestine marriage ▪ the spy's clandestine [=covert] operation
▪ a clandestine [=secret] meeting ▪ a clandestine marriage ▪ the spy's clandestine [=covert] operation
— clan·des·tine·ly adverb
▪ spies working clandestinely [=in secret, covertly]
▪ spies working clandestinely [=in secret, covertly]
