berserk

Short definition from Wiktionary

Noun

1. 1
   Synonym of berserker (“a Norse warrior who fought in a frenzy”).

Adjective

1. 1
   Furiously, injuriously, or maniacally violent or out of control.
2. 2
   Bizarre; weird.
3. 3
   Wildly joyous; ecstatic.

Verb

1. 1
   To be or become berserk.
2. 2
   To make berserk.