clandestine
Pronunciation:
/klænˈdɛstɪn//klænˈdɛstɪn/adjective
Definitions
Done or kept in secret, sometimes to conceal an illicit or improper purpose.
Example: clandestine military operations
Synonyms:covertfurtivehush-hushsecretsecretiveundercover(of a person or lodge) Not recognized as a regular member.