Of or pert. to, or characterized by, mania, or excitement.
The point about manic depression or bipolar disorder, as it's now more commonly called, is that it's about mood swings. So, you have an elevated mood. When people think of manic depression, they only hear the word depression. They think one's a depressive. The point is, one's a manic-depressive. Stephen Fry
With a lot of comedians, one of their major attributes is that they look comedic, with a certain hangdog or manic expression. I look like the neighborhood bully. That doesn't elicit laughter. Sylvester Stallone