staggeringly

adverb (r)

1. extremely (adv.all)

   Sinonim: all-fired, bloody, boiling, damn, drop-dead, enormously, extraordinarily, goddam, goddamn, goddamned, hellishly, hugely, infernally, inordinately, positively, precious, preciously

   Sumber: wordnet30

2. In a staggering manner. (adverb)

   Sumber: webster1913