Seemly vs Mannerly - What's the difference?

As adjectives the difference between seemly and mannerly

is that seemly is appropriate; suited to the occasion or purpose; becoming while mannerly is polite, having good manners.

is appropriately, fittingly.

(er)

(of behavior) Appropriate; suited to the occasion or purpose; becoming.

His behavior was seemly , as befits a gentleman.

* Shakespeare

I am a woman, lacking wit / To make a seemly answer to such persons.

* Hooker

Suspense of judgment and exercise of charity were safer and seemlier for Christian men than the hot pursuit of these controversies.

* apposite

* unseemly

* * * seemliness

(en adverb)

Appropriately, fittingly.

* 1590 , Edmund Spenser, The Faerie Queene , II.i:

The great earthes wombe they open to the sky, / And with sad Cypresse seemely it embraue [...].

(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