The Collaborative International Dictionary of English v.0.48:
Displeasing \Dis*pleas"ing\, a. Causing displeasure or dissatisfaction; offensive; disagreeable. -- Dis*pleas"ing*ly, adv. -- Dis*pleas"ing*ness, n. --Locke. [1913 Webster]WordNet (r) 3.0 (2006):
displeasingly adv 1: in a displeasing manner; "he made displeasingly cutting remarks about his friends"