1) Immune 2) Immunised 3) Immunized 4) Incapable 5) Insensitive 6) Insusceptible 7) Not susceptible to 8) Resistant 9) Unpersuadable 10) Unresponsive 11) Unsuasible 12) Vaccinated 1) Immune 2) Immunised 3) Immunized 4) Insensitive 5) Insusceptible 6) Resistant 7) Unpersuadable 8) Unsuasible 9) Vaccinated 
[adj] - not susceptible to
insusceptible adjective not susceptible to