clandestine

According to him, 9/11 was an inside job, the Boston Marathon bombing was staged by the FBI and the shooting of former Arizona Congresswoman Gabrielle Giffords was part of a clandestine mind-control operation.

A reporter investigating clandestine timber-harvesting in a Mexican forest encounters a masked logger brandishing a chain saw.

Soleimani was the head of Iran’s notorious Quds Force, an elite, clandestine unit of Iran’s Revolutionary Guards Corps specialising in overseas operations.

Considering the history I just outlined it's not hard to imagine what Trump and Putin are discussing in these little clandestine chats.

Bodies were being dumped on neighborhood sidewalks and in clandestine graves.