insusceptibility

adjective

1. not susceptible; incapable of being influenced or affected (usually followed by of or to): insusceptible of flattery; insusceptible to infection.

adjective

1. (when postpositive, usually foll by to) not capable of being affected (by); not susceptible (to)

n.

1. The state or condition of not being susceptible to a disease or infection; immunity.