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")

Antonyms of adj impaired

2 senses of impaired

Sense 1
impaired (vs. unimpaired) -- (diminished in strength, quality, or utility; "impaired eyesight")

unimpaired (vs. impaired) -- (not damaged or diminished in any respect; "his speech remained unimpaired")

Sense 2
afflicted, impaired -- (mentally or physically unfit)

INDIRECT (VIA unfit) -> fit -- (physically and mentally sound or healthy; "felt relaxed and fit after their holiday"; "keeps fit with diet and exercise")

Similarity of adj impaired

2 senses of impaired

Sense 1
impaired (vs. unimpaired) -- (diminished in strength, quality, or utility; "impaired eyesight")
       => anosmic -- (having impaired sense of smell)
       => broken -- (weakened and infirm; "broken health resulting from alcoholism")
       => dicky, dickey -- ((British informal) faulty; "I've got this dicky heart"- John le Carre)
       => diminished, lessened, vitiated, weakened -- (impaired by diminution)
       => dysfunctional -- (impaired in function; especially of a bodily system or organ)
       => dyslectic, dyslexic -- (having impaired ability to comprehend written words usually associated with a neurologic disorder)
          Also See-> damaged#1; injured#1

Sense 2
afflicted, impaired -- (mentally or physically unfit)
       => unfit (vs. fit) -- (not in good physical or mental condition; out of condition; "fat and very unfit"; "certified as unfit for army service"; "drunk and unfit for service")