The Collaborative International Dictionary of English v.0.48:
Exorbitantly \Ex*or"bi*tant*ly\, adv. In an exorbitant, excessive, or irregular manner; enormously. [1913 Webster]WordNet (r) 3.0 (2006):
exorbitantly adv 1: to an exorbitant degree; "prices are exorbitantly high in the capital" [syn: exorbitantly, extortionately, usuriously]