arduously

from WordNet (r) 3.0 (2006)
arduously
    adv 1: in an arduous manner; "they worked arduously"
    
from The Collaborative International Dictionary of English v.0.48
Arduously \Ar"du*ous*ly\, adv.
   In an arduous manner; with difficulty or laboriousness.
   [1913 Webster]
    

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