Definition Of unnatural
contrary to the ordinary course of nature; abnormal.
death by unnatural causes
Example Of unnatural
A glance at any science text tells us that monogamy is utterly unnatural , unless of course you're a swan.
A strange, unnatural feeling is beginning to develop among long-term observers of English football: optimism.
Alcohol induces unnatural feelings and makes people act out of character; it's very easy to find oneself in a frightening situation.
And as for the acquaintances they've got back home, they find the newfound attention somewhat forced and unnatural .
And that, of course, is foolish, unwise, and unnatural .