1.
Brooding is used to describe an atmosphere or feeling that makes you feel anxious or slightly afraid. (LITERARY)
The same heavy, ~ silence descended on them.
ADJ: usu ADJ n
2.
If someone’s expression or appearance is ~, they look as if they are thinking deeply and seriously about something, especially something that is making them unhappy. (LITERARY)
She kissed him and gazed into his dark, ~ eyes.
ADJ: usu ADJ n