Unchanging over time or unable to be changed; permanent and unalterable.
From Latin 'immutabilis,' from 'in-' (not) and 'mutare' (to change). Medieval theologians used this word to describe divine attributes that never change, contrasting with mutable earthly things.
Think 'I'm not mutable' - it cannot mutate or change! Like a rock that refuses to budge, immutable things are permanently set in stone.
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