adjective

showing rudeness and a lack of consideration for other people.

it would be unkind and discourteous to decline a visit

rude,impolite,ill-mannered,bad-mannered,disrespectful,uncivil,unmannerly,unchivalrous,ungallant,ungentlemanly,unladylike,ill-bred,churlish,boorish,crass,ungracious,graceless,uncouth,insolent,impudent,cheeky,audacious,presumptuous,curt,brusque,blunt,offhand,unceremonious,short,sharp,uncomplimentary,offensive,insulting,derogatory,disparaging,ignorant,malapert,contumelious,underbred,mannerless