Origin of impaired
Examples from the Web for unimpaired
He proceeded to demonstrate that his sense of humor was unimpaired.Kofi Awoonor, the Ghanaian Poet Killed in Westgate Mall Attack|Michael Daly|September 24, 2013|DAILY BEAST
Pleasure appears as the accompaniment of unimpaired and unimpeded function everywhere as far as our knowledge extends.
As the days passed, the king grew weaker and weaker, but his faculties were never clouded, and his cheerfulness was unimpaired.Lords of the World|Alfred John Church
They all grew lazy out East here (Sterne was very conscious of his own unimpaired activity); they got slack all over.End of the Tether|Joseph Conrad
Still, British landlords did what they liked with their own, and self-government is unimpaired.Mr. Punch's History of Modern England, Vol. I (of 4).--1841-1857|Charles L. Graves
Unimpaired life—life with the power and will to go on living—is the greatest boon and best remedy of any that can be offered.The Lonely Way--Intermezzo--Countess Mizzie|Arthur Schnitzler