clandestine
//klænˈdɛstɪn//
Adjective
clandestineCanonical form
1
Kept secret or done secretively, especially because illicit or unauthorized.
The group held clandestine meetings to plan their escape.
2
Characterized by or conducted with secrecy, often for subversive or illegal purposes.
The police uncovered a clandestine operation to smuggle weapons across the border.