unimpaired /ˌʌnɪmˈpeɚd/ adjective Learner's definition of UNIMPAIRED
: not made weaker or worse by illness, injury, etc. : not impaired未受损的；未削弱的 -
He suffered some brain damage but his speech remained unimpaired.他的脑部受了伤，但语言能力并未受影响。
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unimpaired drivers [=drivers who are not drunk, drugged, etc.]正常状态的司机