Definition of unimpaired adjective from the Oxford Advanced Learner's Dictionary

 

unimpaired

 adjective
adjective
BrE BrE//ˌʌnɪmˈpeəd//
 
; NAmE NAmE//ˌʌnɪmˈperd//
 
(formal)
 
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not damaged or spoiled Although he's ninety, his mental faculties remain unimpaired. opposite impaired
See the Oxford Advanced American Dictionary entry: unimpaired