from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not subject or susceptible to change.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Unable to be changed without exception.
  • adj. Not able to be altered in the memory after its value is set initially, such as a constant.
  • n. Something that cannot be changed.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not mutable; not capable or susceptible of change; unchangeable; unalterable.

from The Century Dictionary and Cyclopedia

  • Not mutable; not capable or susceptible of change; not subject to mutation; unchangeable; invariable; unalterable.
  • In zoology, not subject to variation in different individuals of a species; permanent: as, immutable characters or marks

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not subject or susceptible to change or variation in form or quality or nature


From French, ultimately from Latin immutabilis ("unchangable"); im- +‎ mutable (Wiktionary)



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  • Founded on universal and immutable principles, the church can never grow old or obsolete, but is the church for all times and places, for all ranks and conditions of men.

    Orestes A. Brownson, The American Republic

    November 13, 2011