impair - definition and synonyms

verb [transitive] formal 

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/ɪmˈpeə(r)/
present tense
I/you/we/theyimpair
he/she/itimpairs
present participleimpairing
past tenseimpaired
past participleimpaired
  1. to make something less good or effective, especially by causing damage that affects the way something works

    The condition does not seem to impair his ability to work.