Byronic is an adjective that means moody and melodramatic.
19th century poet Lord Byron provides the origin of our word of the day. He was a romantic English poet known for poetry that was full of melancholy and intense drama. Byronic may be used to describe poetry of this kind, or can be used more broadly to describe anything, like as a person’s behavior, that fits such a description. For example: Catherine’s been acting more Byronic lately. She’s been in a moody frame of mind all week.