nonexposed

adjective

non·​ex·​posed ˌnän-ik-ˈspōzd 

: not exposed to something

nonexposed skin

Of 1,000 male nonsmokers exposed to excess radon, 16 will die of lung cancer, he estimates. That's 5 more than in a nonexposed group.

—U.S. News & World Report

Word History

First Known Use

1837, in the meaning defined above