impair

Definition of Impair in English :

1. impair

make worse or less effective

Example Sentences:
'His vision was impaired'

make imperfect

Example Sentences:
'nothing marred her beauty'

WordNet Lexical Database for English. Princeton University. 2010.

Impair

verb

(transitive)

to reduce or weaken in strength, quality, etc

his hearing was impaired by an accident

verb transitive

to make worse, less, weaker, etc.; damage; reduce

tr.v. im·paired, im·pair·ing, im·pairs

To cause to weaken, be damaged, or diminish, as in quality: an injury that impaired my hearing; a severe storm impairing communications.