The Collaborative International Dictionary of English v.0.48:
Interestingly \In"ter*est*ing*ly\, adv. In an interesting manner. [1913 Webster]WordNet (r) 3.0 (2006):
interestingly adv 1: in an interesting manner; "when he ceases to be just interestingly neurotic and...gets locked up"- Time [ant: uninterestingly]