IPA: /ˈsɪn.ju.əs.nəs/
KK: /ˈsɪn.ju.əs.nəs/
The quality of being curvy or having many twists and turns.
The sinuousness of the river made it a beautiful sight from above.
Sinuousness → It is formed from "sinuous" (from Latin "sinuosus", meaning full of curves or bends) and the suffix "-ness" (meaning the state or quality of). The word "sinuousness" refers to the quality of being full of curves or bends.
Think of the word 'sinuous' which describes something that is 'full of curves' — adding '-ness' indicates the quality of having those curves.