Immune

[Cami]

To have a [high] pain-threshold.

[Tariq Zaki]

unable to be [infected] by a [perticular] desiease because youve taken a [vaccine] against it, it also means, unable to be infulenced by something.

[Vania]

Resistant to a particular infection or toxin owing to the presence of specific antibodies or sensitized white blood cells.