WordNet: covert

secret or hidden; not openly practiced or engaged in or shown or avowed; "covert actions by the CIA"; "covert funding for the rebels"

• also see implicit, inexplicit

• also see concealed

• also see invisible, unseeable

• similar to backstair, backstairs, furtive

• similar to black

• similar to clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground

• similar to secret

• similar to collusive, conniving

• similar to cloaked, disguised, masked

• similar to secret

• similar to behind-the-scenes, sub-rosa, under-the-table

• similar to subterranean, subterraneous, ulterior

• similar to under wraps

• similar to undisclosed, unrevealed

covert

• (englanti) overt (antonym)

• (englanti) covertness (derivationally related)
• (suomi) peitelty (synonyymi)

• (suomi) salainen (synonyymi)