accident

accident,

n 1. an unusual, unforeseen event.
n 2. an unusual or unexpected result attending the performance of a usual or necessary act or event.
n 3. occurring without intent or happening by chance. The term does not have a precise legal definition but is generally used to indicate that an occurrence was not the result of negligence.

accident, cerebrovascular (CVA)

(stroke)
n apoplexy resulting from hemorrhage into the brain or occlusion of the cerebral vessels from an embolism or thrombosis. It can result in paralysis (mainly one side), speech difficulties, and difficulty in maintaining personal hygiene, including oral care.

accident, unavoidable,

n an accident not occasioned, either remotely or directly, by the want of such care or skill as the law holds every person bound to exercise; occurring without fault or negligence.