discourteous
dis-cour-te-ous
adjective
Lacking politeness or good manners; showing rudeness or disrespect towards others.
"His discourteous behaviour offended everyone present."
Thesaurus
Synonyms: ungracious, impolite, ungallant, brusk, curt, abrupt, unchivalrous, brusque, short, caddish, unceremonious
Antonyms: courteous