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

• Lexulous
• Wordscraper
• Wordosaur

adj. Not altering; unchanging, constant.

"He had a flash of Theo sitting across the breakfast table, as he had most enjoyed her during his infrequent visits home: her thin bang of reddish gray hair above her angular face, cheeks flushed with pleasure, the meticulous and unhurried flow of speech as she poured steaming coffee from the thin, old silver pot, and behind her, through the window, the unaltering view of her garden."

unfaltering