Wiktionary
unsuspectingly
adv. In an unsuspecting manner.
WordNet
unsuspectingly
adv. without suspicions; "he was sitting unsuspectingly beyond that wall only a few yards from the burglar"
Usage examples of "unsuspectingly".
She always faithfully and unsuspectingly reported to me when she had again dreamt of horses, without having the least idea that for me this was a stern and covert warning.
I, who on entering the lobby had unsuspectingly cast a glance through the open door of the adjoining gymnasium, caught sight of the leather horse, the climbing bars, the climbing rope, and the horrible horizontal bar, crying out as always for a giant swing.