immutable
adjective, noun
immutable is spelled I-M-M-U-T-A-B-L-E: 9 letters and 4 syllables. It appears about once in every 1 million words in written English, the 34,912th most frequent word form (wordfreq, 2021 data). As an adjective, immutable means “Unable to be changed without exception” (English Wiktionary, September 2026).
How many letters and syllables are in immutable?
| Letters | 9: I-M-M-U-T-A-B-L-E |
|---|---|
| Syllables | 4 (from its American pronunciation) |
| In writing | about once in every 1 million words; the 34,912th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is immutable?
Immutable appears about once in every 1 million words in written English, the 34,912th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce immutable?
- US
Immutable has 4 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-immutable.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with immutable?
No other word on PlainSpell ends in the same sounds as immutable.
Spelled with the same letters in another order: multibeam.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of immutable
- immutables plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does immutable mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Unable to be changed without exception.
The government has enacted an immutable law.
- 2
Not able to be altered in the memory after its value is set initially.
Constants are immutable.
noun
- 1
Something that cannot be changed.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Immutable in Spanish, French, German and Portuguese
In the sense unable to be changed without exception:
| Language | Words |
|---|---|
| French | immuable, immutable |
| German | unveränderbar, unveränderlich |
| Portuguese | imutável |
| Spanish | inmutable |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does immutable come from?
From Middle English immutable, from Latin immūtābilis (“unchangeable”); im- + mutable.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).