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Webster 1913 Edition

Verb.

[Pref.

in-

in +

vulgar

To cause to become or appear vulgar.

[Obs.]

Daniel.

Adj.

[Pref.

in-

not +

vulgar

Not vulgar; refined; elegant.

[Obs.]

Drayton.

invulgar ‎(comparative more invulgar, superlative most invulgar)

(obsolete) Not vulgar; refined; elegant.
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in- +‎ vulgar

invulgar m, f ‎(plural invulgares, comparable)