Simple Definition of impair
: to make (something) weaker or worse
Full Definition of impair
: to damage or make worse by or as if by diminishing in some material respect <his health was impaired by overwork> <the strike seriously impaired community services>
impairmentplay \-mənt\ noun
Examples of impair in a sentence
Smoking can impair your health.
Drinking impairs a person's ability to think clearly.
His memory was so impaired by age that he often forgot where he was.
Origin and Etymology of impair
Middle English empeiren, from Anglo-French empeirer, from Vulgar Latin *impejorare, from Latin in- + Late Latin pejorare to make worse — more at pejorative
First Known Use: 14th century
Synonym Discussion of impair
IMPAIR Defined for Kids
Legal Definition of impair
1 : to damage or make worse by or as if by diminishing <impaired health>
2 : to diminish the value of (property or property rights); specifically : to diminish the value of (legal contractual obligations) to the point that a party loses the benefit of the contract or the contract otherwise becomes invalid <a law impairing a state's own obligations was entitled to less deference — Gerald Gunther> — see also contract clause
Seen and Heard
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