immutable

adjective

im·​mu·​ta·​ble (ˌ)i(m)-ˈmyü-tə-bəl 

: not capable of or susceptible to change

the immutable laws of nature

immutability

(ˌ)i(m)-ˌmyü-tə-ˈbi-lə-tē 

noun

immutableness

(ˌ)i(m)-ˈmyü-tə-bəl-nəs 

noun

immutably

(ˌ)i(m)-ˈmyü-tə-blē 

adverb

Did you know?

Immutable may describe something that is incapable of change, but the word itself—like all words—is mutable, both capable of and prone to alteration. To put a finer point on it, if language were fixed, we wouldn’t have immutable itself, which required a variety of mutations of the Latin verb mutare (“to change”) to reach our tongues (or pens, keyboards, or touchscreens—oh the many permutations of communication!). Other English words that can be traced back to mutare include mutate, transmute, and commute. Which reminds us—the mutability of language makes great food for thought during one’s commute.

Synonyms of immutable

• unchangeable
• unchanging
• fixed

Examples of immutable in a Sentence

the immutable laws of nature

one of the immutable laws of television is that low ratings inevitably lead to cancellation

Recent Examples on the Web

Viewed this way, protections such as immutable backups and isolated backup networks, often cut for budget reasons, look less like expenses and more like insurance against days of downtime. — Michael Wu, Forbes.com, 20 Oct. 2026

While the facts of Umm Kulthum’s life are immutable, Zaki still had to find the woman behind them. — Essie Assibu, Variety, 19 Oct. 2026

Blockchain, despite being popularly associated with cryptocurrency, can be applied to any industry, especially with its technology, which makes the input data immutable. — Roy Stephen Canivel, Footwear News, 31 Aug. 2026

Their interest isn’t a token to be spent on me or somebody else, but rather a more immutable quality that led them to my book and hopefully many more books to come. — Literary Hub, 11 Aug. 2026

Word History

Etymology

Middle English, from Latin immutabilis, from in- + mutabilis mutable

First Known Use

15th century, in the meaning defined above

Rhymes for immutable

• mutable
• suitable
• computable
• disputable
• imputable
• inscrutable
• unsuitable
• executable
• indisputable
• irrefutable
• substitutable

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Kids Definition

immutable

adjective

im·​mu·​ta·​ble (ˈ)im-ˈ(m)yüt-ə-bəl 

: impossible to change

immutability

(ˌ)im-ˌ(m)yüt-ə-ˈbil-ət-ē 

noun

immutably

(ˈ)im-ˈ(m)yüt-ə-blē 

adverb