Learn That Word

Synonyms for Vulgar (same or very similar meaning)

WordNet sense 1 (lacking refinement or cultivation or taste):
coarse, common, uncouth, rough-cut

WordNet sense 2 ((used of persons and their behavior) not refined; uncouth):
unrefined

WordNet sense 3 (of or associated with the great masses of people):
plebeian, unwashed

WordNet sense 4 (of humble birth or origins):
lowborn

WordNet sense 5 (being or characteristic of or appropriate to everyday language):
vernacular

WordNet sense 6 (used of spoken and written language):
informal

WordNet sense 7 (conspicuously and tastelessly indecent):
crude, earthy, gross

WordNet sense 8 (offensive to good taste especially in sexual matters):
indecent


From the ODE community, based on WordNetadd/edit