Definition of "mannerly"

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

c. 1590–1591 (date written), William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

...but Genevieve's laugh roused her again, partly because she thought it less mannerly than accorded with the girl's usual politeness.

1861, Charlotte Yonge, The Young Step-Mother