Secretly; in private; insidiously.
Yes, covertly is an adverb.Some example sentences using this word are:The spy covertly stole the secret plans.The police have been covertly watching him for weeks.
Hidden .
covertly
Covertly (as opposed to overly) means in secret, or while under cover. For example: "Covertly, the child sneaked into the kitchen to steal a cookie, by the time anyone had noticed he had been there he was already gone."
Covertly
No.
secretly
The opposite of openly is secretly, or covertly.
how do you communicate covertly without any devices
quietly, sneakily, furtively, secretly, covertly, surreptitiously ..
i think it is a adjective.Covert is an adjective; covertly is a verb.
"Tacitly" is perhaps the most direct opposite. "Covertly" is another possibility.