The Collaborative International Dictionary
Unvulgarize
Unvulgarize \Un*vul"gar*ize\, v. t. [1st pref. un- + vulgarize.]
To divest of vulgarity; to make to be not vulgar.
--Lamb.
Wiktionary
unvulgarize
vb. (context transitive English) To divest of vulgarity; to make to be not vulgar.