†by covert: under cover, covertly. †in (into) covert: in concealment; in hiding, or disguise, secretly; rarely, in safety. in (the) covert of: in…

in outward show, apparently; disguisedly, in a secret or underhand way.

in a disguised manner, in disguise.

With one's real name, title, or character undisclosed or disguised: used esp. in reference to royal or dignified personages who wish to conceal their…

disguisedly.

= incognito, adv.