manic

Short definition from Wiktionary

Adjective

1. 1
   Characterized by mania or craziness; wicked.
2. 2
   Suffering from mania (the state of an abnormally elevated or irritable mood, arousal, and/or energy levels).

Noun

1. 1
   A person exhibiting mania.
2. 2
   A member of the Manic Street Preachers