WordNet (r) 3.0 (2006):

good manners
    n 1: a courteous manner [syn: courtesy, good manners] [ant:
         discourtesy, rudeness]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "good manners":
   amenities, bienseance, civilities, civility, comity, convention,
   correct deportment, correctitude, correctness, courtesy,
   courtliness, decencies, decorum, diplomatic code, discourtesy,
   elegance, elegancies, etiquette, exquisite manners, formalities,
   good behavior, good citizenship, good form, mannerliness, manners,
   misbehavior, mores, natural politeness, point of etiquette,
   polite behavior, politeness, politesse, poor behavior, proprieties,
   protocol, punctilio, quiet good manners, rules of conduct,
   sanctioned behavior, savoir-faire, savoir-vivre, sociability,
   social code, social conduct, social graces, social procedures,
   social usage