Meaning of “unnatural” in the English Dictionary

"unnatural" in British English

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unnaturaladjective

uk /ʌnˈnætʃ.ər.əl/ us /ʌnˈnætʃ.ɚ.əl/

B2 not natural

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unnaturally
adverb uk /ʌnˈnætʃ.ər.əl.i/ us /ʌnˈnætʃ.ɚ.əl.i/

(Definition of “unnatural” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unnatural" in American English

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unnaturaladjective

us /ʌnˈnætʃ·ər·əl/

not found in nature; artificial:

Nothing unnatural or polluting can be used.
The recordings have an unnatural sound.

Behavior or feelings that are described as unnatural are not usual or acceptable.

(Definition of “unnatural” from the Cambridge Academic Content Dictionary © Cambridge University Press)