vulgar

adj. uncouth, indecent; lacking in taste; vernacular; ordinary; offensively gaudy

"Vulgarism" derives from Latin vulgus, the "common folk", and has carried into English its original connotations linking it with the low and coarse motivations that were supposed to be natural to the commons, who were not moved by higher motives like fame for posterity and honor among peers — motives that were alleged to move the literate classes. Thus the concept of vulgarism carries cultural freight from the outset, and from some social and religious perspectives it does not genuinely exist, or — and perhaps this amounts to the same thing – ought not to exist.
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Adjective
1. lacking refinement or cultivation or taste; "he had coarse manners but a first-rate mind"; "behavior that branded him as common"; "an untutored and uncouth human being"; "an uncouth soldier--a real tough guy"; "appealing to the vulgar taste for violence"; "the vulgar display of the newly rich"
(synonym) coarse, common, rough-cut, uncouth
(similar) unrefined
2. of or associated with the great masses of people; "the common people in those days suffered greatly"; "behavior that branded him as common"; "his square plebeian nose"; "a vulgar and objectionable person"; "the unwashed masses"
(synonym) common, plebeian, unwashed
(similar) lowborn
3. being or characteristic of or appropriate to everyday language; "common parlance"; "a vernacular term"; "vernacular speakers"; "the vulgar tongue of the masses"; "the technical and vulgar names for an animal species"
(synonym) common, vernacular
(similar) informal
4. conspicuously and tastelessly indecent; "coarse language"; "a crude joke"; "crude behavior"; "an earthy sense of humor"; "a revoltingly gross expletive"; "a vulgar gesture"; "full of language so vulgar it should have been edited"
(synonym) coarse, crude, earthy, gross
(similar) indecent

adv. vulgarly, coarsely, obscenely, popularly, foully

adj. vulgar, crude, uncouth, indecent, vernacular, ordinary

adj. vulgar, uncouth, indecent; lacking in taste; vernacular; ordinary; offensively gaudy

n. vulgarian, vulgar person, rich person who makes an offensively gaudy display of his wealth