a person who is weak or unable to take care of themselves on account of illness, injury, or a health condition
she spent the rest of her life as an invalid
her invalid husband
remove (someone) from active service in the armed forces because of injury or illness
he was badly wounded and invalided out of the infantry
(of an official document or procedure) not legally recognized because it contravenes a regulation or law
the will was declared invalid and the children were entitled to the estate