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Impossible to alter: the unalterable season of bitter cold in Siberia.
un·al′ter·a·bil′i·ty, un·al′ter·a·ble·ness n.
(of a condition, truth, etc) unable to be changed or altered
un•al•ter•a•ble(ʌnˈɔl tər ə bəl)
not capable of being altered, changed, or modified.
un•al′ter•a•ble•ness, un•al`ter•a•bil′i•ty, n.
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|Adj.||1.||unalterable - not capable of being changed or altered; "unalterable resolve"; "an unalterable ground rule"|
alterable - capable of being changed or altered in some characteristic; "alterable clothing"; "alterable conditions of employment"
|2.||unalterable - of a sentence; that cannot be changed; "an unalterable death sentence"|
law, jurisprudence - the collection of rules imposed by authority; "civilization presupposes respect for the law"; "the great problem for jurisprudence to allow freedom while enforcing order"
incommutable - not subject to alteration or change
|3.||unalterable - remaining the same for indefinitely long times|
unchangeable - not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"