impair

1. Make worse or less effective (synset 200263767)
   "His vision was impaired"
   is a type of: damage - inflict damage upon
2. Make imperfect (synset 200478872)
   "nothing marred her beauty"
   is a type of: damage - inflict damage upon
   subtypes:

   • cloud, corrupt, defile, sully, taint - place under suspicion or cast doubt upon
   • blemish, deface, disfigure - mar or spoil the appearance of
   same as: deflower, mar, spoil, vitiate

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