early 15c., "not in accord with physical nature," from un- (1) "not" + natural (adj.). Meaning "artificial" is attested from 1746; that of "at variance with moral standards" is from 1520s. Related: Unnaturally; unnaturalness.
an unnatural death
the child's unnatural interest in death
unmounted
unmovable
unmoved
unmuzzled
unnamed
unnatural
unnecessary
unneeded
unnerve
unnoticed
unnumbered
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