The Collaborative International Dictionary of English v.0.48:
Preternaturally \Pre`ter*nat"u*ral*ly\ (?; 135), adv. In a preternatural manner or degree. --Bacon. [1913 Webster]WordNet (r) 3.0 (2006):
preternaturally adv 1: in a supernatural manner; "she was preternaturally beautiful" [syn: preternaturally, supernaturally]