The quality of being clever and good at understanding what is needed or likely to be useful.
Shrewdnesses is usually a good thing because it means someone is smart and can make good decisions.
Examples:
Her shrewdnesses in business helped her make a lot of money.
His shrewdnesses in negotiation always impresses me.
The fox showed its shrewdnesses in finding food.
The detective used his shrewdnesses to solve the case.
The king's shrewdnesses in battle led to many victories.
The cat's shrewdnesses in catching mice made it very successful.