transitive verb. To cause to weaken, be damaged, or diminish, as in quality.

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.

noun. Diminution; decrease; loss; injury; disgrace.

Unequal; unworthy; unjust.

Not one of a pair; odd; unmatched.

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

noun. In roulette, an odd number.

transitive verb. To grow worse; to deteriorate.

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

noun. Diminution; injury.

adjective. Not fit or appropriate.

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

verb. make worse or less effective

verb. make imperfect