1. Lacking refinement, cultivation or taste
   "appealing to the vulgar taste for violence"; "the vulgar display of the newly rich";
   - coarse, common, rough-cut, uncouth
    
2. Conspicuously and tastelessly indecent
   "a vulgar gesture"; "full of language so vulgar it should have been edited";
   - crude, earthy, gross, coarse, salty, ripe [informal]
    
3. (disparaging) of or associated with ordinary, common people
   "a vulgar and objectionable person";
   - common, plebeian, unwashed
    
4. Being or characteristic of or appropriate to everyday language
   "the vulgar tongue of the masses"; "the technical and vulgar names for an animal species";
   - common, vernacular

See also: indecent, informal, lowborn, unrefined

Encyclopedia: Vulgar