- to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage: to impair one's health; to impair negotiations.
- to grow or become worse; lessen.
- Archaic. impairment.
Origin of impair1
SynonymsSee more synonyms on Thesaurus.com
- noting any odd number, especially in roulette.
Examples from the Web for impair
Formerly to impair the morals was a minor was a punishable offense.Holy Homophobia, Batman! A Queer Reading of the Dark Knight
July 26, 2014
In other words, researchers were able to prove that THC should, technically, impair driving, but not that it does.The Truth About Driving While Stoned
June 12, 2014
Does Ambien impair judgment enough to drive one to violent crime?Is the ‘Ambien Defense’ Total Bullsh*t?
April 15, 2014
The liver is one of the few human organs that regenerates, so having pieces removed usually does not impair function.Jobs’s Unorthodox Treatment
October 6, 2011
Was this enough to impair the pilots but not enough to destroy the airplane in the air?How Flight 447 Fell Intact From the Sky
July 2, 2009
Thus we see that there are many causes which impair the happiness of friends.Lysis
And he went about it with a zest that knew no flagging, with a relish that nothing could impair.St. Martin's Summer
He can do the same with his real estate but can not impair her dower.
He can do this with his property, but can not impair her dower rights.
He may do this but can not impair her dower right to one-third.
- (tr) to reduce or weaken in strength, quality, etchis hearing was impaired by an accident
Word Origin and History for impair
late 14c., earlier ampayre, apeyre (c.1300), from Old French empeirier (Modern French empirer), from Vulgar Latin *impeiorare "make worse," from assimilated form of in- "into, in" (see in- (2)) + Late Latin peiorare "make worse" (see pejorative). In reference to driving under the influence of alcohol, first recorded 1951 in Canadian English. Related: Impaired; impairing.