Definitions

1. adjective

not existing or occurring in nature; not natural or spontaneous

“The nonnatural substances in the food additives were a major concern for the health experts.”

2. adjective

not following the usual or expected course of nature; abnormal or unusual

“The nonnatural weather patterns led to severe droughts in several regions.”

3. noun

something that is not natural or spontaneous; a manufactured or artificial thing

“The use of nonnatural materials in construction led to significant energy savings.”