'Impaired' definitions:

Definition of 'impaired'

From: WordNet
adjective
Diminished in strength, quality, or utility; "impaired eyesight" [ant: unimpaired]
adjective
Mentally or physically unfit [syn: afflicted, impaired]

Definition of 'Impaired'

From: GCIDE
  • Impair \Im*pair"\, v. t. [imp. & p. p. Impaired; p. pr. & vb. n. Impairing.] [Written also empair.] [OE. empeiren, enpeiren, OF. empeirier, empirier, F. empirer, LL. impejorare; L. pref. im- in + pejorare to make worse, fr. pejor worse. Cf. Appair.] To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate; as, to impair health, character, the mind, value. [1913 Webster]
  • Time sensibly all things impairs. --Roscommon. [1913 Webster]
  • In years he seemed, but not impaired by years. --Pope.
  • Syn: To diminish; decrease; injure; weaken; enfeeble; debilitate; reduce; debase; deteriorate. [1913 Webster]