unimpair

== English == === Etymology === From un- +‎ impair. === Verb === unimpair (third-person singular simple present unimpairs, present participle unimpairing, simple past and past participle unimpaired) (transitive, rare) To restore from an impaired condition. 2006, United States. Congress. House. Committee on Government Reform. Subcommittee on Regulatory Affairs, Taking on water (page 6) The mission of the National Park Service is expressly to preserve, unimpair the natural and cultural resources and values of the National Park System for the enjoyment, education and inspiration of this and future generations.