discourteously

from WordNet (r) 3.0 (2006)

discourteously
    adv 1: in an impolite manner; "he treated her impolitely" [syn:
           {impolitely}, {discourteously}, {rudely}] [ant:
           {courteously}, {politely}]

from The Collaborative International Dictionary of English v.0.48

Discourteous \Dis*cour"te*ous\ (?; see {Courteous}, 277), a.
   [Pref. dis- + courteous: cf. OF. discortois.]
   Uncivil; rude; wanting in courtesy or good manners;
   uncourteous. -- {Dis*cour"te*ous*ly}, adv. --
   {Dis*cour"te*ous*ness}, n.
   [1913 Webster]