'Staggeringly' definitions:

Definition of 'staggeringly'

From: WordNet
adverb
Extremely; "he was enormously popular" [syn: enormously, tremendously, hugely, staggeringly]

Definition of 'Staggeringly'

From: GCIDE
  • Staggeringly \Stag"ger*ing*ly\, adv. In a staggering manner. [1913 Webster]