The silent treatment is a form of emotional abuse designed to break the recipient of the silent treatment down. It is a passive aggressive behavior utilized to trigger a response from the recipient and get them to a act in a specific way that the narcissistic individual had in mind. It's a form of punishment that can last for hours to weeks to months. They literally will act like you are non-existent and it can trigger an abandonment complex within the recipient that causes them to become desperate for the silence to stop. It is in a sense emotional abandonment. It's cruel because it is insidious it takes zero effort from the narcissistic individual and it inflicts maximum damage on the recipient who is typically anxiously attached to the narcissist.