This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. That cannot be reformed.

Not reformable; not capable of being reformed or amended.

adj. insusceptible of reform

adj. unrepentant and incapable of being reformed

"Nevertheless, he is described as a "major Gaulliste" and in turn is describing EMU as "unreformable", leading to a monetary squeeze that was driving the French economy into slump."

wicked    incorrigible   

irredeemable