- (v.t.) To make worse; to diminish in quantity, value, excellence or strength; to deteriorate; as, to impair health, character, the mind, value.
- (n.) Diminution; injury.
- (v.t.) To grow worse; to deteriorate.
- (a.) Not fit or appropriate.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). impair. Retrieved September 20, 2026, from http://smartdefine.org/impair/definitions/2019352 |
| Chicago | Webster's. 2011. "impair" http://smartdefine.org/impair/definitions/2019352 (accessed September 20, 2026). |
| Harvard | Webster's 2011, impair, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/impair/definitions/2019352>. |
| MLA | Webster's. "impair" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/impair/definitions/2019352> |