adj, noun ·4 syllables ·Common ·High school level

Definitions

Noun

1. 1
   Something that cannot be changed.

Adjective

1. 1
   Unable to be changed without exception. not-comparable

   "The government has enacted an immutable law."

2. 2
   Not able to be altered in the memory after its value is set initially. not-comparable

   "Constants are immutable."

Adjective

1. 1
   not subject or susceptible to change or variation in form or quality or nature wordnet
2. 2
   constant and unchanging wordnet

Synonyms

All synonyms

constantunalterableunchangeableunchangeableabidingaccordant

Antonyms

All antonyms

mutablenonimmutablevariable

Example

More examples

"An accident is an inevitable occurrence due to the action of immutable natural laws."

Etymology

From Middle English immutable, from Latin immūtābilis (“unchangeable”); im- + mutable.

Related phrases

strongly immutableweakly immutable

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.