Synonyms for Crass:

adj.

•coarse, insensitive (adjective)
indelicate, inelegant, churlish, gross, rude, philistine, raw, vulgar, unrefined, rough, uncouth, boorish.
•loud (adjective)
tawdry.
•low (adjective)
undignified.
•vulgar (adjective)
common, chintzy, brazen, idiomatic, cheap, inelegant, garish, ignoble, animal, rough, glaring, salty, unseemly, indelicate, clumsy, boorish, coarse-grained, unbecoming, raw, rude, tasteless, obscene, undignified, unrefined, outlandish, base, in bad taste, barbaric, unpolished, vulgar, coarse, low, barnyard, profane, repulsive, graceless, rank, degraded, offensive, philistine, brutish, ill-bred, gross, depraved, homespun, sleazy, tactless, broad, shameless, gaudy, earthy, crude, sordid, colloquial, tawdry, cockney, scandalous, ignominious, revolting.

n.

ill-mannered, abrasive, impertinent, discourteous, insolent, smart, impolite, impudent. •crass (noun)
indelicate, coarse, crude, unrefined, tactless, rude.
•gross (noun)
materialistic.

Other synonyms:

uncouth, churlish, uncultured. uncivilized, barbarian, uncultivated. •Other relevant words:
ill-mannered, barbarian, materialistic, churlish, uncultivated, uncultured, uncivilized, uncouth.