Insusceptible
Insusceptible , adjective
[Prefix in- not + susceptible: compare French insusceptible.]
Not susceptible; not capable of being moved, affected, or impressed; that can not feel, receive, or admit; as, a limb insusceptible of pain; a heart insusceptible of pity; a mind insusceptible to flattery; new strains of bacteria insusceptible to penicillin.