Mannerly vs Mannered - What's the difference?

As adjectives the difference between mannerly and mannered

is that mannerly is polite, having good manners while mannered is having manners or (often excessive) mannerisms.

(en adjective)

polite, having good manners

* 1593, William Shakespeare, Two Gentlemen of Verona

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

* 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.

* mannerliness

(en adjective)

Having manners or (often excessive) mannerisms.

His upbringing had led him to act in an overly mannered way.