mannerly

adj

1. Having good manners; polite.

   “Lucetta, as thou lov'st me, let me have / What thou think'st meet, and is most mannerly.”

   “Tut, tut, here is a mannerly forbearance: / The truth appeares ſo naked on my ſide, / That any purblind eye may find it out.”

   “1861, Charlotte Yonge, The Young Step-Mother ...but Genevieve's laugh roused her again, partly because she thought it less mannerly than accorded with the girl's usual politeness.”

adv

1. With good manners; politely.