immutable

immutable
adjective
im·;mu·;ta·;ble (;)i(m)-;my;-t;-b;l
Synonyms of immutable
: not capable of or susceptible to change
immutability
(;)i(m)-;my;-t;-;bi-l;-t;
 noun
immutableness
(;)i(m)-;my;-t;-b;l-n;s
 noun
immutably
(;)i(m)-;my;-t;-bl;
 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
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
Examples are automatically compiled from online sources to show current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Blockchain can create a verifiable, immutable, and real-time accessible system that saves time for both the state and citizens.
—Javier Bastardo, Forbes.com, 1 Aug. 2025
Published in 1915, and already widely accepted worldwide by physicists and mathematicians, the theory assumed the universe was static – unchanging, unmoving and immutable.
—Rob Coyne, Space.com, 13 July 2025
The Bar will not consider race, ethnicity, or other immutable characteristics when considering applicants for the Leadership Development Summit or Leadership Academy.
—Elijah Guevara, The Washington Examiner, 19 July 2025
Write my mission, values and non-negotiables as an immutable constitution under 250 words.
—Jodie Cook, Forbes.com, 18 July 2025
Word History
Etymology
Middle English, from Latin immutabilis, from in- + mutabilis mutable

First Known Use
15th century, in the meaning defined above

Time Traveler
The first known use of immutable was in the 15th century
See more words from the same century