Definitions from Wiktionary (impair)

▸ verb:  (transitive) To weaken; to affect negatively; to have a diminishing effect on.
▸ verb:  (intransitive, archaic) To grow worse; to deteriorate.
▸ adjective:  (obsolete) Not fit or appropriate; unsuitable.
▸ noun:  (obsolete) The act of impairing or deteriorating.
▸ noun:  (obsolete) The fact of being impaired or having grown worse.
▸ noun:  (obsolete) An impairment or deterioration.
▸ Also see impair

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