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The Collaborative International Dictionary
Displeasantly

Displeasant \Dis*pleas"ant\, a. [OF. desplaisant, F. d['e]plaisant. See Displease.] Unpleasing; offensive; unpleasant. [Obs.]
--Speed. -- Dis*pleas"ant*ly, adv. [Obs.]
--Strype. -- Dis*pleas"ant*ness, n. [Obs.]

Wiktionary
displeasantly

adv. In a displeasant manner.