If you make bad decisions in the morning after drinking coffee, you might conclude that caffeine tends to impair your judgment. When you impair something, you damage it or make it work poorly.

The root of the verb impair traces back to the Latin word pejorare, meaning “to make worse,” and that’s still what happens if you impair something. Whether it’s communication, visibility, or your marriage prospects, if you impair it, you make it worse. The word can be used for situations that describe something that has deteriorated, such as “Snow continued to impair driving conditions.”

Definitions of impair
  1. verb
    make worse or less effective
    “His vision was impaired
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    type of:
    inflict damage upon
  2. verb
    make imperfect
    synonyms: deflower, mar, spoil, vitiate
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    cloud, corrupt, defile, sully, taint
    place under suspicion or cast doubt upon
    blemish, deface, disfigure
    mar or spoil the appearance of
    mangle, maul
    injure badly by beating
    mark, pit, pock, scar
    mark with a scar
    type of:
    inflict damage upon
Word Family