How to Say "resistant" in Spanish
The Spanish word for “resistant” is “inmune” — B1 level. This is a very common word in everyday Spanish.

Examples
Después de la vacuna, eres inmune al virus.
After the vaccine, you are immune to the virus.
Algunas personas parecen ser inmunes a la gripe.
Some people seem to be immune to the flu.
Su sistema inmune está muy fuerte ahora.
Their immune system is very strong right now.
One word for everyone
This word doesn't change for boys or girls. You can say 'él es inmune' or 'ella es inmune' without changing the ending.
The 'A' connection
When you want to say what someone is immune to, always use the word 'a' immediately after 'inmune'.
Using 'de' instead of 'a'
Mistake: “Soy inmune de la gripe.”
Correction: Soy inmune a la gripe. (In Spanish, you are immune 'to' something, not 'of' something.)
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