credulously

from WordNet (r) 3.0 (2006)

credulously
    adv 1: in a credulous manner; "the children followed the teacher
           credulously" [syn: {credulously}, {believingly}] [ant:
           {disbelievingly}, {incredulously}, {unbelievingly}]

from The Collaborative International Dictionary of English v.0.48

Credulously \Cred"u*lous*ly\, adv.
   With credulity.
   [1913 Webster]