not reduced or weakened in strength, quality, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use unimpaired in a sentence
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 | THE DAILY BEAST
The dream state of his own omniscience has remained entirely unimpaired.
Their Iodized Collodion is highly sensitive, and retains all its qualities unimpaired for three months.
It has been well said of him in explanation of his success, that he lived eighty years and preserved his digestion unimpaired.
The principles of the two measures, he said, were the same—any alterations which had been made left its efficiency unimpaired.The History of England in Three Volumes, Vol.III. | E. Farr and E. H. Nolan
His duty is to administer the present government as it came to his hands, and to transmit it unimpaired by him to his successor.Key-Notes of American Liberty | Various
The wholesome balance between self-respect and a laudable desire for the esteem of men was plainly unimpaired.The Life of Nelson, Vol. I (of 2) | A. T. (Alfred Thayer) Mahan