The Collaborative International Dictionary of English v.0.48:
Deceptively \De*cep"tive*ly\, adv. In a manner to deceive. [1913 Webster]WordNet (r) 3.0 (2006):
deceptively adv 1: in a misleading way; "the exam looked deceptively easy" [syn: deceptively, deceivingly, misleadingly]