Which word describes someone who is not capable of being reformed?

The term "incorrigible" specifically refers to an individual who is beyond the possibility of reform or improvement. It suggests a certain level of stubbornness or obstinacy that makes the person resistant to any form of correction or change. This word is often used in contexts where someone's behavior or character has proven to be unchangeable despite attempts to alter it.

In contrast, options like "reformable," "correctable," and "amendable" imply the potential for change or improvement. "Reformable" suggests that the person can indeed be reformed; "correctable" denotes that their mistakes can be rectified; and "amendable" indicates that they are open to making changes or adjustments. Therefore, none of these alternatives capture the essence of being incapable of reform, which is the defining characteristic of being incorrigible.