Collins Concise English Dictionary © HarperCollins Publishers::

impair /ɪmˈpɛə/ vb
  1. (transitive) to reduce or weaken in strength, quality, etc: his hearing was impaired by an accident
Etymology: 14th Century: from Old French empeirer to make worse, from Late Latin pējorāre, from Latin pejor worse; see pejorative

imˈpairable adj imˈpairer n imˈpairment n

'impaired' also found in these entries:

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