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Synonyms
im·pair (ĭm-pâŕ)

[Middle English empairen, from Old French empeirer, from Vulgar Latin* impēiōrāre, Latin in-, causative pref.; see in–2, + Late Latin pēiōrāre, to worsen (from Latin pēior, worse; see ped-).]

transitive verb: -paired, -pair·ing, -pairs. 

To cause to diminish, as in strength, value, or quality: an injury that impaired my hearing; a severe storm impairing communications.

derivatives

im·paiŕment
noun