Source : Webster's Revised Unabridged Dictionary (1913)

Mannerly \Man"ner*ly\, a.
   Showing good manners; civil; respectful; complaisant.

         What thou thinkest meet, and is most mannerly. --Shak.

Mannerly \Man"ner*ly\, adv.
   With good manners. --Shak.

Source : WordNet®

mannerly
     adj : socially correct in behavior [syn: {well-mannered}]