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

impair + -ed2

unimpaired, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unimpaired (ˌʌnɪmˈpɛəd)
not reduced or weakened in strength, quality, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1583, from un- (1) "not" + pp. of impair. Rare before c.1760.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The headwaters are unimpaired, with the exception of a number of reservoirs.
Complaints may be few, and physical health may remain unimpaired, though
  emotional health is far harder to gauge.
He is physically unimpaired afterward, as coy and debonair as ever, but his
  mind has begun playing tricks.
The cognitive ability of the rats was unimpaired in other respects.
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