in a covert manner

open and observable; not secret or hidden

the state of being covert and hidden

implied though not directly expressed; inherent in the nature of something

hidden on any grounds for any motive

impossible or nearly impossible to see; imperceptible by the eye

secret and sly or sordid

(of intelligence operations) deliberately misleading

conducted with or marked by hidden aims or methods

indulging only covertly

acting together in secret toward a fraudulent or illegal end