The state of being very thin.
Skinninesses can be seen as good or bad, depending on the situation.
Examples:
Her skinninesses made her look fragile.
The skinninesses of the model made some people worried.
The skinninesses of the dog concerned the vet.
The skinninesses of the pencil made it easy to break.
The skinninesses of the tree branches made them look like fingers reaching out.
The skinninesses of the thread made it hard to see.