Brooding

[Tina]

Expressing deep sorrow or remorse. To dwell on a misfortunate outcome of an event with regret or displeasure.

[PussyCat]

Thinking gloomily about something, ruminating anxiously or regretfully about something.

[Sarah]

What Ryan Atwood of the OC, spends 90% of his time doing.
aka
sitting quietly, and looking angry.

[Little_Girl]

When ones bottom lip is breathed in and out in moments of extreme disappointment, regret, envy, or misfortune. Also known as BLT or Bottom Lip Treatment.

[Monty]

Engaged in or showing deep thought about something that makes one sad, angry, or worried.

[Dianne]

making you feel uncomfortable or worried, as if something bad is going to happen:

[PussyCat]

Showing deep unhappiness of thought.