immutable
ih-MYOO-tuh-buladjMeaning never changing; unable to be changed
Memory hook IM-MUT-able: the statue never changes. Sun, snow, rain or wind, the old stone statue in the square keeps the very same pose year after year. It is immutable.
For Grandma, Sunday dinner at five o’clock was an immutable rule.
In context Fashions and slang change every few years, but some things are immutable: the sun still rises in the east, just as it did a thousand years ago.
Similar unchangeable, fixed, permanent, constant
Opposite mutable, changeable, variable
From Latin immutabilis: im (not) + mutabilis (changeable).