The Collaborative International Dictionary
Inalterable \In*al"ter*a*ble\, a. [Pref. in- not + alterable: cf. F. inalt['e]rable.] Not alterable; incapable of being altered or changed; unalterable. -- In*al"ter*a*ble*ness, n. -- In*al"ter*a*bly, adv.
Wiktionary
a. That cannot be altered.
WordNet
adj. not capable of being changed or altered; "unalterable resolve"; "an unalterable ground rule" [syn: unalterable] [ant: alterable]
Usage examples of "inalterable".
Literature can never conform to the dictates of pure euphony, while grammar, which has been shaped not in the interests of prosody, but for the service of thought, bars the way with its clumsy inalterable polysyllables and the monotonous sing-song of its inflexions.
If my religion teaches that it is the inalterable and inerrant word of God that the Universe is a few thousand years old, then scientists are being offensive and impious, as well as mistaken, when they claim it's a few billion.