'Unpleasantly' definitions:

Definition of 'unpleasantly'

(from WordNet)
adverb
In an unpleasant manner; "he had been unpleasantly surprised" [ant: agreeably, enjoyably, pleasantly]

Definition of 'Unpleasantly'

From: GCIDE
  • Unpleasant \Un*pleas"ant\, a. Not pleasant; not amiable or agreeable; displeasing; offensive. -- {Un*pleas"ant*ly}, adv. -- {Un*pleas"ant*ness}, n. [1913 Webster]