clandestine in Russian
clandestine in Russian
нелега́льный
Done or kept in secret, sometimes to conceal an illicit or improper purpose.
подпо́льный
Done or kept in secret, sometimes to conceal an illicit or improper purpose.
секре́тный
Done or kept in secret, sometimes to conceal an illicit or improper purpose.
та́йный
Done or kept in secret, sometimes to conceal an illicit or improper purpose.