1
not used before a noun
a
: not capable of being affected by a disease
—usually + to
Most people are immune to the disease.
b
: not influenced or affected by something
—+ to
They are immune to persuasion/criticism.
She is immune to the power of advertising.
2
not used before a noun
: having special protection from something that is required for most people by law
The court ruled that he was immune from prosecution [=that he could not be prosecuted] because of his diplomatic status.
immune [=exempt] from punishment
3
always used before a noun
: of or relating to the body's immune system
immune cells
an immune response/reaction
Cite this Entry
“Immune.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/immune. Accessed 21 Apr. 2026.
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