blankly

from WordNet (r) 3.0 (2006)

blankly
    adv 1: without expression; in a blank manner; "she stared at him
           blankly"

from The Collaborative International Dictionary of English v.0.48

Blankly \Blank"ly\, adv.
   1. In a blank manner; without expression; vacuously; as, to
      stare blankly. --G. Eliot.
      [1913 Webster]

   2. Directly; flatly; point blank. --De Quincey.
      [1913 Webster]