Not natural. / Not occurring in nature, the environment or atmosphere / Going against nature; perverse.

In an unnatural manner; to an unnatural extent.

The state of being unnatural.

Not naturalized.

Third-person singular simple present indicative form of unnaturalize

(transitive, rare) To make unnatural.

present participle of unnaturalize

plural of unnaturalness

(uncountable) The condition of being unnatural. / (countable) Something that does not occur naturally.

plural of unnaturality