discourteous

/dɪsˈkʌrtiəs/

If you're rude or inconsiderate, you're discourteous. It would be discourteous to invite only four of your classmates to your party in front of the whole class.

Burping on purpose, pushing your way to the front of a line, failing to send a thank you note for a generous gift, deliberately hurting someone's feelings, or failing to bow when you meet the Queen: these are all discourteous ways of behaving. When you're courteous, you have excellent manners and you're very thoughtful. Add the prefix dis-, meaning "lack of," and you get discourteous.

Definitions of discourteous

1. adjective

   showing no courtesy; rude
   “a distant and at times discourteous young”

   synonyms:

   abrupt

   surprisingly and unceremoniously brusque in manner

   brusk, brusque, curt, short

   marked by rude or peremptory shortness

   caddish, unchivalrous, ungallant

   offensively discourteous

   unceremonious

   without due formalities

   disrespectful

   exhibiting lack of respect; rude and discourteous

   antonyms:

   courteous

   characterized by courtesy and gracious good manners

   chivalrous, gallant, knightly

   being attentive to women like an ideal knight

   respectful

   full of or exhibiting respect
2. adjective

   lacking social graces
   synonyms: ungracious

   impolite

   not polite