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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