Arduously
The Century Dictionary and Cyclopedia
In an arduous manner; with laboriousness.
the GNU version of the Collaborative International Dictionary of English
adverb.
In an arduous manner; with difficulty or laboriousness.
Wiktionary, Creative Commons Attribution/Share-Alike License
adverb.
in an
arduous
manner
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adverb.
in an arduous manner
Word Usage
""To think" and to take a matter "seriously," "arduously" -- that is one and the same thing to them; such only has been their "experience.""