Search Result for "onerously": 
Wordnet 3.0

ADVERB (1)

1. in an onerous manner; 



The Collaborative International Dictionary of English v.0.48:

Onerously \On"er*ous*ly\, adv.
   In an onerous manner.
   [1913 Webster]


WordNet (r) 3.0 (2006):

onerously
    adv 1: in an onerous manner