unimpaired

adjective

1. weakened, diminished, or damaged: impaired hearing; to rebuild an impaired bridge.
2. functioning poorly or inadequately: Consumption of alcohol results in an impaired driver.
3. deficient or incompetent (usually preceded by an adverb or noun): morally impaired; sports-impaired.

adjective

1. not reduced or weakened in strength, quality, etc

adj.1580s, from un- (1) “not” + past participle of impair. Rare before c.1760.