This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In an inalterable way.

"A stunning story about how love and war inalterably change the lives of those they touch, The Surrendered is elegant, suspenseful, and unforgettable: a profound meditation on the nature of heroism and sacrifice, the power of love, and the possibilities for mercy and salvation."

unalterably