Wiktionary
beserk
a. Injuriously, maniacally, or furiously violent or out of control. n. A crazed Norse warrior who fought in a frenzy.
Usage examples of "beserk".
Research people told Gordon that any horse given ethyl isobutrazine would go utterly beserk and literally try to climb the walls.
Whenever the control was relaxed, this whole mess would boil over into the murderous beserk rage that made the warriors of the hills such valued mercenaries.
Her heart went beserk for a moment, and after tat Tibby forgot why she was supposed to avoid the wonderfully clever mouth that sent sizzling heat vils from her toes to the top of her head.
A Palestinian armed with a knife had gone beserk in the Christian Quarter, slashing some nuns.