This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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

v. to weaken; to affect negatively; to have a diminishing effect on.

v. To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate.

v. To grow worse; to deteriorate.

adj. Not fit or appropriate.

n. Diminution; injury.

To make worse; diminish in quantity, value, excellence, strength, or any other desirable quality; deteriorate; weaken; enfeeble: as, to impair the health or character; to impair one's fortune.

Synonyms To lessen, decrease, reduce, injure.

To become worse; be lessened or enfeebled; deteriorate.

n. Diminution; decrease; loss; injury; disgrace.

Unequal; unworthy; unjust.

Not one of a pair; odd; unmatched.

n. An impaired or odd thing; an article without a mate.

n. In roulette, an odd number.

v. make worse or less effective

v. make imperfect

"Limits on expression impair the Chinese quality of life, mutes the ability of its political economy to secure progress, and can allow legitimate grievances to fester until they get out of control."

improve    amend   

impaired    impairing    impairs   

damage   

spoil   

impairment   

deteriorate    diminish    enfeeble    weaken    debilitate    debase    injure    decrease    reduce    diminution   

Adair    Aer    Altair    Astaire    Ayre    Baer    Bear    Blair    Cher    Clair   

insuff    parenchyma    antigen-specific    T cell    dysfunction    impairment    fibroblast    heatstroke    mucosal    oxidative