If you’ve been sick with the flu for a week, barely able to get out of bed, then you’ve got an idea of what it’s like to be incapacitated. Incapacitated means "empty of strength," "helpless," or "powerless."
Incapacitated is an adjective that describes a state where you don’t have the capacity, or ability, to accomplish anything. When someone becomes incapacitated, illness or injury is usually to blame. This adjective is often used in the same manner as disabled. Incapacitated can also mean "ineligible." For instance, if you are too old to join the army, then your age makes you incapacitated from serving in the army.