Source : Webster's Revised Unabridged Dictionary (1913)

Insusceptible \In`sus*cep`ti*ble\, a. [Pref. in- not +
   susceptible: cf. F. 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. -- {In`sus*cep`ti*bly} adv.

Source : WordNet®

insusceptible
     adj : not susceptible to [syn: {unsusceptible}] [ant: {susceptible}]