What is the plural of “stiffness”?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Magical Minnie Puzzles

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Chapters
00:00 What Is The Plural Of “Stiffness”?
00:30 Accepted Answer Score 5
02:22 Thank you

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Full question
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Tags
#grammaticalnumber #uncountablenouns

#avk47