Synonyms of impair in English:

impair


See definition of impair

verb

1‘even one drink can impair driving performance’

SYNONYMS
damage, harm, diminish, reduce, weaken, lessen, decrease, blunt, impede, hinder, mar, spoil, disable
undermine, compromise, threaten
informal foul up, put the kibosh on
rare vitiate
ANTONYMS

improve, enhance