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English word invalid comes from Latin validus (Healthy, well. Strong. Valid. Worthy.), English in-
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validus (Latin)
Healthy, well. Strong. Valid. Worthy.
in- (English)
In, into (non-productive) Added to adjectives to mean not. (non-productive) Added to nouns to mean lacking or without. (non-productive) Used with certain words to reverse their meaning In, into, towards, within.
invalidus (Latin)
Infirm, impotent, weak, feeble.
invalide (Middle French)
invalid (English)
(archaic) A disabled member of the armed forces; one unfit for active duty due to injury.. (dated, sometimes, offensive) 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.. (dated, sometimes, offensive) Any person with a disability or illness. (British) To exempt from duty because of injury or ill health. [...]