Generally treated as a non-gradable adjective; comparative and superlative forms are normally avoided.
He seemed immune to the criticism and continued with his work.
Il semblait insensible aux critiques et a continué son travail.
exemptS’emploie surtout dans le registre juridique ou administratif. As a diplomat, she was immune from prosecution under the host country's laws.
En tant que diplomate, elle était exemptée de poursuites en vertu des lois du pays hôte.
After receiving the vaccine, she was immune to the virus.
Après avoir reçu le vaccin, elle était immunisée contre le virus.