immutability

unchangeability

Roots

im- / in- (not): not or without
mut: change

Other words with the mut root

immutable: unchanging
mutability: capacity for change
mutable: able to change
mutant: changed from the usual form
mutate: to change form or character
mutation: a change or alteration

Immutability is the state of not being changeable.

The contract treated the deadline with the immutability of a law of physics.

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