Antonyms of noun courtesy
1 of 3 senses of courtesy                                               
Sense 3
courtesy, good manners -- (a courteous manner)
       Antonym of discourtesy (Sense 2)
      => discourtesy, rudeness -- (a manner that is rude and insulting)
Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun courtesy
3 senses of courtesy                                                    
Sense 1
courtesy -- (a courteous or respectful or considerate act)
       => politeness, civility -- (the act of showing regard for others)
Sense 2
courtesy -- (a courteous or respectful or considerate remark)
       => remark, comment, input -- (a statement that expresses a personal opinion or belief or adds information; "from time to time she contributed a personal comment on his account")
Sense 3
courtesy, good manners -- (a courteous manner)
       => manner, personal manner -- (a way of acting or behaving)

