Unchangeable

Nuttall's Standard Dictionary of the English Language · 1890 · p. 191

un-tchaynj -a-bl, a. not capable of ] change; immutable. Unchangeably, un-tchaynj'- a-ble, ad. without change. Unchangeablene , untchaynj'-a-bl-nes, s. the state of being unchangeable.