immutable

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

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immutable (not comparable)

1. Unable to be changed without exception.

   Synonym: unchangeable

   The government has enacted an immutable law.

   • 1834, L[etitia] E[lizabeth] L[andon], chapter XIV, in Francesca Carrara. […], volume II, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC, page 171:

     Mutable as is our nature, it delights in the immutable: and we expect as much constancy as if all time, to say nothing of our own changeableness, had not shewn that ever "the fashion of this world passeth away."

   • 2019, Peter Kent, Tyler Bain, Cryptocurrency Mining For Dummies, John Wiley & Sons, →ISBN, page 30:

     In the trustless cryptocurrency world, you can still trust the cryptocurrency community and its mechanisms to ensure that the blockchain contains an accurate and immutable—unchangeable—record of cryptocurrency transactions.

2. (programming, of a variable) Not able to be altered in the memory after its value is set initially.

   Constants are immutable.

• mutable
• nonimmutable

immutable (plural immutables)

1. Something that cannot be changed.

• multibeam

Learned borrowing from Latin immūtābilis. Compare immuable.

• IPA^(key): /i.my.tabl/

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immutable (plural immutables)

1. (rare) immutable

   Synonym: immuable

2. (programming) immutable

• “immutable”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

• inmutable, inmutabull, inmutabulle, ymmutable

Borrowed from Latin immutabilis; equivalent to in- +‎ mutable.

• IPA^(key): /i(n)ˌmiu̯ˈtaːbəl/, /i(n)ˌmiu̯ˈtaːblə/

immutable (Late Middle English)

1. immutable, unchangeable

• English: immutable

• “immūtāble, adj.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007.