Adverb
with desperation
Source: WordNet`Why can't you understand?,' she asked despairingly Source: Internet
"The Fenollosa Papers" in Stock (1965), 177–179 Robert Graves recalled "I once asked Arthur Waley how much Chinese Pound knew; Waley shook his head despondently." Source: Internet
Instead of doing anything useful, they "attack" by committing mass suicide in front of the cross ("Zat showed 'em, huh?" says the dying Otto, to which Brian despondently replies "You silly sods!" Source: Internet