Wiktionary
disbelievingly
adv. In a disbelieving manner; in a manner that is difficult to believe
WordNet
disbelievingly
adv. in an incredulous manner; "the woman looked up at her incredulously" [syn: incredulously, unbelievingly] [ant: credulously, credulously]
Usage examples of "disbelievingly".
And then somehow, disbelievingly, she was safe in the shadow of the buildings, running through the arch.