Wordnet 3.0
ADVERB (1)
1. 
 in a futile and unproductive manner; 
The Collaborative International Dictionary of English v.0.48:
Futilely \Fu"tile*ly\, adv.
   In a futile manner.
   [1913 Webster]
WordNet (r) 3.0 (2006):
futilely
    adv 1: in a futile and unproductive manner