immutably
Adverb
Meaning
in an unalterable and unchangeable manner
Source: WordNetSynonyms
unchangeably
unalterably
permanently
irreversibly
invariably
immovably
inalienably
lastingly
unassailably
ineffaceably
Antonyms
Examples
When we consider the being and substance of that universe in which we are immutably set, we shall discover that neither we ourselves nor any substance doth suffer death. For nothing is in fact diminished in its substance, but all things, wandering through infinite space, undergo change of aspect.
his views were unchangeably fixed