Как по Английски будет sicurezza di sé

noun

The feeling or belief that one can have faith in or rely on someone or something.

Примеры использования:

We had every confidence in the staff

noun

The telling of private matters or secrets with mutual trust.

Примеры использования:

Someone with whom you may raise your suspicions in confidence

noun

Confidence that you have in your own abilities

Примеры использования:

She’s an extrovert who exudes self-assurance.