(transitive) To weaken; to affect negatively; to have a diminishing effect on. / (intransitive, archaic) To grow worse; to deteriorate.

(obsolete) Not fit or appropriate; unsuitable.

The result of being impaired / A deterioration or weakening / A disability or handicap / an inefficient part or factor. / (accounting) A downward revaluation, a write-down.

Rendered less effective. / inebriated, drunk.

simple past tense and past participle of impair

A criminal charge for driving a vehicle while impaired.

present participle of impair

impairment

Third-person singular simple present indicative form of impair

plural of impairment