The CIA fought a covert war against the Soviets in Afghanistan.

Sami had a covert evil nature.

ISIS is a terrorist organization covertly supported by many "civilized" nations including Qatar, Turkey, and the United States.

Subjugation of the lower classes is important to our covert centralization of resources.

This is covert racism.

A bug on the Macintosh version of the Flash software allows malicious websites to covertly eavesdrop on visitors using their webcam and microphone.

Police conducted covert surveillance.

We are sent on a covert mission.