Crudely indecent. Deficient in taste, delicacy, or refinement. Marked by a lack of good breeding; boorish. See Synonyms at common. Offensively excessive in self-display or expenditure; ostentatious: the huge vulgar houses and cars of the newly rich. Spoken by or expressed in language spoken by the common people; vernacular: the technical and vulgar names for an animal species. Of or associated with the great masses of people; common.