demurely

from WordNet (r) 3.0 (2006)

demurely
    adv 1: in a demure manner; "the army girl, tall and demurely
           pretty, threw a quick side-glance at her"

from The Collaborative International Dictionary of English v.0.48

Demurely \De*mure"ly\, adv.
   In a demure manner; soberly; gravely; -- now, commonly, with
   a mere show of gravity or modesty.
   [1913 Webster]

         They . . . looked as demurely as they could; for 't was
         a hanging matter to laugh unseasonably.  --Dryden.
   [1913 Webster]