Source : Webster's Revised Unabridged Dictionary (1913)

Staunch \Staunch\, Staunchly \Staunch"ly\, Staunchness
\Staunch"ness\, etc.
   See {Stanch}, {Stanchly}, etc.

Source : WordNet®

staunchly
     adv : in a staunch manner; "he staunchly defended his principles"
           [syn: {stanchly}]