Irreformable is a word that describes something that cannot be reformed or changed. There are several synonyms for this word, including immutable, inflexible, unalterable, unchangeable, fixed, and rigid. Each of these words describes something that is not subject to change or alteration, whether it be a policy, a mindset, or a physical object. The word irreformable can also be used to describe something that is corrupt or irredeemable, which is why synonyms like incorrigible and irretrievable can also be used. Essentially, any word that conveys the idea that something cannot be changed or reformed can be considered a synonym for irreformable.