Sparsities are the state of being scarce or in short supply, like when there isn't much of something.
Sparsities are usually not good because it means there isn't enough of something that is needed.
Examples:
The sparsities of food made it hard to find something to eat.
In some places, the sparsities of water make life difficult.
The sparsities of toys at the store made the children sad.
The sparsities of good weather in this place are funny.
The sparsities of kindness in the world are very sad.
The sparsities of stars in the sky make it hard to count them all.