Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb impair

2 senses of impair

Sense 1
impair -- (make worse or less effective; "His vision was impaired")
       => damage -- (inflict damage upon; "The snow damaged the roof"; "She damaged the car when she hit the tree")

Sense 2
mar, impair, spoil, deflower, vitiate -- (make imperfect; "nothing marred her beauty")
       => damage -- (inflict damage upon; "The snow damaged the roof"; "She damaged the car when she hit the tree")