immutable

[ih-myoo-tuh-buhl]

adjective

1. not mutable; unchangeable; changeless.

2. Computers.,  (in object-oriented programming) of or noting an object with a fixed structure and properties whose values cannot be changed.

immutable

/ ɪˈmjuːtəbəl /

adjective

1. unchanging through time; unalterable; ageless

   immutable laws

Other Word Forms

• immutability noun
• immutableness noun
• immutably adverb

Word History and Origins

Origin of immutable¹

First recorded in 1375–1425; late Middle English, from Latin immūtābilis; im- ², mutable

Example Sentences

He believes in a single, immutable truth—either you win, or you lose.

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If there’s one immutable fact about TV, it is that there’s no such thing as a sure thing.

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But so far, those limitations have involved just a small percentage of prop bets for one simple and immutable reason.

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The Combat Antisemitism Movement also suspended Heritage’s membership in the task force, noting in a formal letter, “Your speech implicitly suggested … the Holocaust is an immutable historical event. It is worthy of study, not debate.”

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AI appears to be running up against some immutable laws of common sense.

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Related Words

• abiding 
• enduring 
• immovable 
• inflexible 
• sacrosanct