immutable

C2+ Topic:Time

US /ɪˈmjutəbəl/ UK /ɪˈmjuːtəbəl/ See IPA manual

adj

Meanings

1

adj
unchanging over time; not capable of being altered

The laws of physics are treated as immutable.

Thesaurus

Synonyms

1 adj · unchanging over time; not... unchangeable unalterable fixed permanent constant invariable

Opposites

mutable changeable variable alterable

Word family

Forms immutably

Derived forms immutablyimmutabilityimmutableness

Related forms mutable mutate mutation mutual

Etymology

From Latin immutabilis ('unchangeable'), from in- ('not') + mutabilis ('changeable'), from mutare ('to change').

immutabilis Latin mutare Latin *mey- Proto-Indo-European

View etymology graph ->

Topics

Time Word Formation & Derivatives

# immutable

**Type:** Word
**Level:** C2+
**Part of speech:** adj
**IPA (US):** ɪˈmjutəbəl
**IPA (UK):** ɪˈmjuːtəbəl

## Meanings
1. unchanging over time; not capable of being altered

## Examples
- The laws of physics are treated as immutable.

## Synonyms
- unchangeable
- unalterable
- fixed
- permanent
- constant
- invariable

## Antonyms
- mutable
- changeable
- variable
- alterable

## Derived Forms
- immutably
- immutability
- immutableness

## Related Forms
- mutable
- mutate
- mutation
- mutual

## Roots and Affixes
- Root: immutabilis
- Root: mutare
- Root: *mey-

## Etymology
From Latin immutabilis ('unchangeable'), from in- ('not') + mutabilis ('changeable'), from mutare ('to change').

## AI Etymology
immutable comes from Latin immutabilis ('unchangeable'), from in- ('not') + mutabilis ('changeable'), from mutare ('to change'). Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the adjective sense is "unchanging over time; not capable of being altered", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as mutable, mutate, mutation, and mutual, and in derivatives such as immutably, immutability, and immutableness. Its semantic neighborhood includes unchangeable, unalterable, fixed, and permanent, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin immutabilis, Latin mutare, and Proto-Indo-European *mey-.

## Topics
- Time
- Word Formation & Derivatives

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