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Not to be altered; immutable: the unchangeable seasons.
un·change′a·bil′i·ty, un·change′a·ble·ness n.
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|Noun||1.||unchangeableness - the quality of being unchangeable; having a marked tendency to remain unchanged|
quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
absoluteness - the quality of being absolute; "the absoluteness of the pope's decree could not be challenged"
constancy, stability - the quality of being enduring and free from change or variation; "early mariners relied on the constancy of the trade winds"
innateness - the quality of being innate
irreversibility - the quality of being irreversible (once done it cannot be changed)
unalterability, fixedness - the quality of being fixed and unchangeable; "the fixedness of his gaze upset her"
unexchangeability - the quality of being incapable of exchange or interchange