noun

rude and inconsiderate behaviour.

he was able to discourage visitors without obvious discourtesy

rudeness,impoliteness,ill manners,lack of manners,bad manners,ill-manneredness,lack of civility,incivility,disrespect,disrespectfulness,unmannerliness,ungentlemanly behaviour,ungraciousness,churlishness,boorishness,ill breeding,uncouthness,crassness,insolence,impudence,impertinence,curtness,brusqueness,abruptness