Synonyms and related words :
callow, chintzy, crude, improper, in bad taste, inappropriate, indecent, indecorous, indiscreet, inelegant, lewd, malodorous, offensive, rough, rude, tasteless, unbecoming, unbeseeming, uncouth, undecorous, undignified, unfitting, ungenteel, ungodly, unseemly, unsuitable, untasteful, untoward, vulgar, wanton