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

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

This is covert racism.

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

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

Sami had a covert evil nature.

We are sent on a covert mission.

Police conducted covert surveillance.