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Adjective: immutable  i'myoo-tu-bul
  1. Not subject or susceptible to change or variation in form or quality or nature
    "the view of that time was that all species were immutable, created by God";
    - changeless
  2. Constant and unchanging
    "the immutable laws of nature"
  3. (programming, of a variable) having a value that cannot be changed after it is initialized

See also: constant

Antonym: changeable

Encyclopedia: Immutable