Why is "fastly" not a word?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Drifting Through My Dreams

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Chapters
00:00 Why Is &Quot;Fastly&Quot; Not A Word?
00:39 Accepted Answer Score 21
01:42 Answer 2 Score 6
02:12 Answer 3 Score 0
03:07 Thank you

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Full question
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Tags
#wordusage #adverbs

#avk47