v. a.
1.
Deteriorate, injure, vitiate, make worse, harm.
2.
Lessen, diminish, decrease, make less.
3.
Weaken, enfeeble, enervate.
IMPAIR
Meaning of IMPAIR in English
Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012
v. a.
1.
Deteriorate, injure, vitiate, make worse, harm.
2.
Lessen, diminish, decrease, make less.
3.
Weaken, enfeeble, enervate.
Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012