Synonyms for Ungracious (same or very similar meaning)
WordNet sense 1 (lacking graciousness):
graceless, unpleasingWordNet sense 2 (rude and boorish):
churlishWordNet sense 3 (lacking social graces):
discourteousWordNet sense 4 (not polite):
impoliteFrom the ODE community, based on WordNetadd/edit