immutable
adjective C2- Unable to be changed without exception. · The government has enacted an immutable law.
- Not able to be altered in the memory after its value is set initially. · Constants are immutable.
From the library
When I thought of the heavy rains and looked at the gaping roof I understood how strong and immutable must be the purpose which had kept him in that inhospitable abode.
She realized that both of them were essentially seeking resonance, whether through the ephemeral vibrations of a string or the immutable stability of metal.
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