What is another word for hard-and-fast?

Need synonyms for hard-and-fast? Here's a list of similar words from our thesaurus that you can use instead.

Having been established and usually not subject to change
“… hard-and-fast rules that governed the corporate environment in those days included strictures regarding office dress that were rigidly enforced.”
Not capable of changing or being changed
“… hard-and-fast beliefs that are the rock-solid foundation of their religion.”
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