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Wordnet 3.0

ADVERB (1)

1. in an arduous manner;
- Example: "they worked arduously"


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]
WordNet (r) 3.0 (2006):

arduously adv 1: in an arduous manner; "they worked arduously"