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English word immune comes from Latin munus, Latin ingratus (Thankless. Ungrateful. Unpleasant, disagreeable.)
munus (Latin)
A burden, duty, obligation. A gift. A service, favor. A service, office, employment. A spectacle, public show.
ingratus (Latin)
Thankless. Ungrateful. Unpleasant, disagreeable.
immunis (Latin)
Free or exempt from taxes or public service. Giftless, without presents.
immun (Middle French)
immune (English)
(rare, transitive) To make immune. (by extension) Not vulnerable.. (medicine) Of or pertaining to the immune system.. (medicine, usually with "to") Protected by inoculation, or due to innate resistance to pathogens.. (usually with "from") Exempt; not subject to. (epidemiology) A person who is not susceptible to infection by a particular disease.