Not valid; not true, correct, acceptable or appropriate.
Your argument is invalid because it uses circular reasoning.
Suffering from disability or illness.
Invalidism therefore referred to a lack of power as well as a tendency toward illness. It is for this reason that I choose to discuss the invalid woman rather than just the ill one.
Any person with a disability or illness.
A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
A disabled member of the armed forces; one unfit for active duty due to injury.
To exempt from (often military) duty because of injury or ill health.
He was invalided home after the car crash.
From Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”).
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To make invalid or affect with disease.