Other forms: consiglieres
In the mafia, a consigliere is a trusted confidant. You can also use the word to describe someone you can count on to keep your secrets and give really good advice.
If your best friend is incredibly wise and loyal, she's your consigliere — your advisor and counselor. In organized crime, a consigliere functions the same way, as a trusted, high-ranking member of the crime family. A mafia boss relies on his consigliere the way you rely on your BFF. Consigliere is an Italian word meaning "advisor," from the Latin root consilium, "advice."