v. t. | 1. | To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate; |
1. | To grow worse; to deteriorate. | |
a. | 1. | Not fit or appropriate. |
n. | 1. | Diminution; injury. |
Verb | 1. | impair - make worse or less effective; "His vision was impaired" |
2. | impair - make imperfect; "nothing marred her beauty" |