1. A state of intense and profound sorrow or melancholy, often lasting and affecting one's emotional well-being
After the loss of her beloved pet, she fell into deep sadness.
Após a perda do seu animal de estimação querido, ela caiu em tristeza profunda.
2. Emotional pain or grief that goes beyond temporary unhappiness
The deep sadness in his eyes revealed the weight he was carrying.
A tristeza profunda nos seus olhos revelava o peso que ele carregava.