To be immune to something is to be resistant to it. If you had chickenpox as a child, you should be immune to it now.

The adjective immune comes from the Latin word immunis, which means “exempt from public service.” If you're protected — or exempt — from disease, injury, work, insults, or accusations, then you're immune. Vaccinations serve to make people immune to certain diseases. Being a diplomat makes people immune to certain legal persecution. To be immune to bullying means that you don’t let the bad behavior of your peers get you down.

Definitions of immune

adj relating to the condition of immunity

“the immune system”

adj relating to or conferring immunity (to disease or infection)

insusceptible, unsusceptible
not susceptible to

adj (usually followed by `to') not affected by a given influence

immune to persuasion”
undergoing no change when acted upon

adj secure against

immune from taxation as long as he resided in Bermuda”
immune from criminal prosecution”
(of persons) freed from or not subject to an obligation or liability (as e.g. taxes) to which others or other things are subject

n a person who is immune to a particular infection

Typhoid Mary
United States cook who was an immune carrier of typhoid fever and who infected dozens of people (1870-1938)
carrier, immune carrier
(medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others
Type of:
individual, mortal, person, somebody, someone, soul
a human being

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