invalid

Not valid; not true, correct, acceptable, or appropriate.

• Your argument is invalid because it uses circular reasoning.
• This invalid contract cannot be legally enforced.

Any person with a disability or illness.datedoffensivesometimes

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.datedoffensivesometimes

A disabled member of the armed forces; one unfit for active duty due to injury.archaic

Suffering from disability or illness.not-comparable

• 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.

Intended for use by an invalid.not-comparable

To exempt from (often military) duty because of injury or ill health.UKtransitive

• He was invalided home after the car crash.

To make invalid or affect with disease.transitive