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