shrewd, shrewdly, crafty

Definition:

The term "shrewd" describes a person who is intelligent and clever, especially in practical matters.

Often the term "shrewd" has a meaning that is partly negative since it usually also involves being selfish.
A shrewd person is usually focused on helping himself, not others.
Other ways to translate this term could include "cunning" or "crafty" or "smart" or "clever," depending on the context.
A "crafty" person knows how to deceive others so they will do what he wants them to do.