If you describe someone as manic, you mean that they do things extremely quickly or energetically, often because they are very excited or anxious about something. He was really manic He seemed to have an almost manic energy. + manically man·ic·al·ly We cleaned the house manically over the weekend
If you describe someone's smile, laughter, or sense of humour as manic, you mean that it seems excessive or strange, as if they were insane. a manic grin
affected with or marked by frenzy or mania uncontrolled by reason; "a frenzied attack"; "a frenzied mob"; "the prosecutor's frenzied denunciation of the accused"- H W Carter; "outbursts of drunken violence and manic activity and creativity"
(also called Bipolar Disorder) A condition in which a person swings between deep depression and great elation in a short period of time, usually a day or so, and does this continuously for at least a week Drug abuse can sometimes cause similar symptoms See Bipolar Disorder in the Encyclopedia section
If someone is manic-depressive, they have a medical condition in which they sometimes feel excited and confident and at other times very depressed. She told them that her daughter-in-law was manic-depressive A manic-depressive is someone who is manic-depressive. Her mother is a manic depressive