impair (v.)
- abate
- abrade
- abstract
- abuse
- afflict
- aggravate
- aggrieve
- bate
- befoul
- bewitch
- blemish
- blight
- condemn
- corrupt
- cripple
- crucify
- curse
- curtail
- damage
- decrease
- deduct
- defile
- deprave
- depreciate
- derogate
- despoil
- destroy
- deteriorate
- detract
- dilapidate
- diminish
- disadvantage
- disparage
- distress
- doom
- drain
- embitter
- envenom
- erode
- exacerbate
- extract
- harass
- harm
- hex
- hurt
- infect
- injure
- irritate
- jinx
- leach
- lessen
- maltreat
- mar
- menace
- mistreat
- molest
- outrage
- persecute
- poison
- pollute
- prejudice
- purify
- reduce
- refine
- remove
- retrench
- ruin
- sap
- savage
- shorten
- spoil
- subtract
- taint
- tarnish
- thin
- threaten
- torment
- torture
- undermine
- violate
- vitiate
- weaken
- weed
- withdraw
- worsen
- wound
- wrong