Source : Webster's Revised Unabridged Dictionary (1913)

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

   2. Directly; flatly; point blank. --De Quincey.

Source : WordNet®

blankly
     adv : in a blank manner; "she stared at him blankly" [syn: {without
           expression}]