Adverb
in a secretive manner; with a preference for secrecy
Source: WordNetthe teacher raised a hand to him, slightly and secretively, because he was her favorite Source: Internet
He secretively borrowed funds, pawned his mother's jewellery and made preparations with a consortium of privateers. Source: Internet
Stowe (1999), 26. Nancy is shown either boldly in the center of the action or actively, but secretively, investigating a clue. Source: Internet