IMPAIR
impair
(verb) make worse or less effective; “His vision was impaired”
mar, impair, spoil, deflower, vitiate
(verb) make imperfect; “nothing marred her beauty”
Source: WordNet® 3.1
Etymology
Verb
impair (third-person singular simple present impairs, present participle impairing, simple past and past participle impaired)
(transitive) To weaken; to affect negatively; to have a diminishing effect on.
(intransitive, archaic) To grow worse; to deteriorate.
Synonyms
• blunt, diminish, hurt, lessen, mar, reduce, weaken, worsen
Adjective
impair (comparative more impair, superlative most impair)
(obsolete) Not fit or appropriate; unsuitable.
Source: Wiktionary
Im*pair", v. t. [imp & p. p. Impaired; p. pr. & vb. n. Impairing.]
[Written also empair.] Etym: [OE. empeiren, enpeiren, OF. empeirier,
empirier, F. empirer, LL. impejorare; L. pref. im- in + pejorare to
make worse, fr. pejor worse. Cf. Appair.]
Definition: To make worse; to diminish in quantity, value, excellence, or
strength; to deteriorate; as, to impair health, character, the mind,
value.
Time sensibly all things impairs. Roscommon.
In years he seemed, but not impaired by years. Pope.
Syn.
– To diminish; decrease; injure; weaken; enfeeble; debilitate;
reduce; debase; deteriorate.
Im*pair", v. t.
Definition: To grow worse; to deteriorate. Milton.
Im"pair, a. Etym: [F. impair uneven, L. impar; im- not + par equal.]
Definition: Not fit or appropriate. [Obs.]
Im*pair", n.
Definition: Diminution; injury. [Obs.]
Source: Webster’s Unabridged Dictionary 1913 Edition