covert

They’ve been doing covert “crawls” with the goal of locating and destroying Vecna before he turns the town, then the world, into an oozy wasteland.

The BBC obtained a covert recording of Miles meeting an unknown man, apparently on the pretext of carrying out a business deal.

He became angry if the university student did not reply to his messages, acting in a "demanding, controlling and covert" way, she told the trial.

Western officials say Russia is seeking to destabilize members of the North Atlantic Treaty Organization through covert acts of sabotage it can easily deny.

Once there, she became an unwitting participant in covert CIA experiments known as MK-Ultra.