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Related to unnatural: Unnatural death
a. Not in accordance with what usually occurs in nature: a tree with an unnatural shape.
b. Not included in nature; artificial: detergents and other unnatural chemicals.
a. Deviating from a behavioral or social norm: a child's unnatural attachment to a doll.
b. Brutal or unfeeling: unnatural cruelty.
3. Stilted, affected, or awkward: an unnatural smile.