unalterable

[ uhn-awl-ter-uh-buh l ]

/ ʌnˈɔl tər ə bəl /

not capable of being altered, changed, or modified.

Also inalterable.

Origin of unalterable

First recorded in 1610–15; un-¹ + alterable

un·al·ter·a·ble·ness, un·al·ter·a·bil·i·ty, noun un·al·ter·a·bly, adverb

Unalterable” is code for “we have no intention of changing the system, period.

Jewish Responses to the Supreme Court’s Same-Sex Marriage Rulings |Sigal Samuel |June 27, 2013 |DAILY BEAST
The law of nature is unalterable; God Himself cannot alter it any more than He can alter a mathematical axiom.

Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 |Various
I even see that the contrary would cost you more, for nature has gifted your heart with unalterable calmness.

Library Of The World's Best Literature, Ancient And Modern, Vol 3 |Various
An experience in the unalterable nature of the thing itself must be undergone.

Bunyan Characters |Alexander Whyte

My love for you is unalterable; our souls are linked by bonds that time cannot dissolve.

The World's Greatest Books, Vol VII |Various
I am not one of those who think that a science, as such, has natural and unalterable boundaries.

Harmonies of Political Economy |Frdric Bastiat

unalterable

/ (ʌnˈɔːltərəbəl, -ˈɔːltrəbəl) /

(of a condition, truth, etc) unable to be changed or altered