immutable
Americanadjective
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not mutable; unchangeable; changeless.
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Computers. (in object-oriented programming) of or noting an object with a fixed structure and properties whose values cannot be changed.
adjective
Other Word Forms
Derived Forms
Etymology
Origin of immutable
First recorded in 1375–1425; late Middle English, from Latin immūtābilis; see im- 2, mutable
Explanation
If you can't change it, it's immutable. There are many things in life that are immutable; these unchangeable things include death, taxes, and the laws of physics. The adjective immutable has Latin roots that mean "not changeable." The Latin prefix for not is in, but the spelling changes when the prefix is put before the consonant m. It is im before a root word starting with m as in immutable. If you learn this rule, you'll know the immutable fact that immutable begins with i-m-m.
Vocabulary lists containing immutable
The Vocabulary.com Top 1000
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Narrative of the Life of Frederick Douglass
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"Sinners in the Hands of an Angry God" by Jonathan Edwards
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
This is proof of his optimization skills, not some immutable law of the universe.
From The Wall Street Journal • Jan. 30, 2026
Even if we do, that doesn’t change this immutable fact: How a person comes to know David Bowie cements the version of him living forever in your memory and soul.
From Salon • Jan. 24, 2026
Cryptocurrencies are actually ill-suited for major criminal enterprises because transactions are permanent, immutable and traceable.
From The Wall Street Journal • Jan. 13, 2026
But that’s not the most important part, which is that this is a beautiful, solid, immutable printed book.
From Los Angeles Times • Dec. 8, 2025
The way a word is used this year is its phenotype, but it has a deeply seated, immutable meaning, often hidden, which is the genotype.
From "The Lives of a Cell" by Lewis Thomas
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
