English
immutableness
From immutable + -ness.
A compound of immutable + -ness
Latin mūtō
Latin mūtābilis ‘mutable, changeable, inconstant’
Latin immūtābilis ‘unchangeable’
Middle English immutable ‘immutable, unchangeable’
English immutable
Today it means
noun The state of being immutable; unchangeableness.
Language periods are conventional ranges, not dates for this word.
Etymograph / immutableness