IPA: /ˈskɪnɪnəs/
KK: /ˈskɪnɪnəs/
The quality or state of being very thin or having little body fat.
Her skinniness made it difficult for her to find clothes that fit well.
Skinniness is formed from "skin" (from Old Norse *skinn*, meaning the outer covering of an animal) and the suffix "-ness" (meaning the state or quality of). The word "skinniness" refers to the state of being thin or having little flesh.
Think of the word 'skin' as the outer covering, and '-ness' indicates a state. So, skinniness means the state of having little flesh, like a thin skin.