Not pleasurably. Usually in negative constructions, as part of a litotes.
Early 19th century; earliest use found in The New Monthly Magazine. From un- + pleasurably, after unpleasurable.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。