Source : Webster's Revised Unabridged Dictionary (1913)

Apprehensively \Ap`pre*hen"sive*ly\, adv.
   In an apprehensive manner; with apprehension of danger.

Source : WordNet®

apprehensively
     adv : with anxiety or apprehension; "we watched anxiously" [syn: {anxiously},
            {uneasily}]