invalid

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. [...]