impair
1. [ verb ] make worse or less effective
Examples:

"His vision was impaired"

Related terms: damage damage
2. [ verb ] make imperfect
Synonyms: mar vitiate deflower spoil
Examples:

"nothing marred her beauty"

Related terms: damage defile deface blemish defloration impairer
Similar spelling:   impairer
  impaired
  impart
  imparting
  impartial
  Imber