Difference between Unnatural and Mannered

UNNATURAL vs MANNERED: ADJECTIVE

Not natural; contrary, or not conforming, to the order of nature; being without natural traits.
Brutal or unfeeling.
Deviating from a behavioral or social norm.
Not included in nature; artificial.
Not in accordance with what usually occurs in nature.
Distorted and unnatural in shape or size; abnormal and hideous
Speaking or behaving in an artificial way to make an impression
Stilted, affected, or awkward.
Not natural; supernatural or artificial.
Not in accordance with or determined by nature; contrary to nature
Going against nature; perverse.
Not normal; not typical or usual or regular or conforming to a norm
Not occuring in the environment or atmosphere

Artificial, etc. See factitious.
=Syn. 1-3. Preternatural, etc. See supernatural.
Not in conformity to nature; not agreeable to the real character of persons or things; not representing nature; forced; strained; affected; artificial: as, unnatural images or descriptions.
Acting without the affections of our common nature; not having the feelings natural to humanity; being without natural instincts: as, an unnatural parent.
Contrary to nature
Not normal
Not natural; contrary to nature; monstrous; especially, contrary to the natural feelings: as, unnatural offenses.

Marked by a constantly repeated manner or method, especially in art or literature; characterized by maunerism; artificial; unnatural; affected.
Having or possessed of manners, carriage, or demeanor; in compounds, having manners of a certain kind, as in ill-mannered, well-mannered.

Strained, Constrained, Eery, Spooky, Stilted, Unco, Violent, Agonistic, Ugly, Monstrous, Uncanny, Eerie, Contrived, Artificial, Grotesque

Sociable, Affable, Likeable, Easygoing, Amiable, Genteel, Respectful, Personable, Considerate, Gentlemanly, Courteous, Mannerly, Polite, Affected, Unnatural

Strained, Constrained, Eery, Spooky, Stilted, Unco, Violent, Agonistic, Ugly, Monstrous, Uncanny, Eerie, Contrived, Artificial, Grotesque

Sociable, Affable, Likeable, Easygoing, Amiable, Genteel, Respectful, Personable, Considerate, Gentlemanly, Courteous, Mannerly, Polite, Affected, Unnatural

Chances are, it will feel scary and unnatural.
His honesty and incorruptibility were insurmountable, almost unnatural.
These sorts of differences are not unnatural, however.
Melanoma appears as unnatural growth, mostly in moles.
Natural is now considered unnatural and the unnatural is natural.
Society which lives by fear alone is an unnatural Society in an unnatural State.
Unnatural carnal knowledge is sexual intercourse with a person in an unnatural manner or with an animal.
She told me both children had an unnatural beauty, an unnatural goodness.
Mohawks, unnatural balding, unnatural single patches of hair, asymmetrical styles, etchings, braids, locks and twists are not allowed.
When unnatural thinness became attractive, girls did unnatural things to be thin.