beserk- frenziedly violent or destructive; also beserker, a member of a class of ancient Norse warriors who worked themselves into a frenzy before battle and fought with insane fury and courage
- C19 Icelandic berserkr, from bjorn bear+serkr shirt
Moreover, the word "amok" has anthropological grounding with various accounts of lonely, frustrated and disturbed men who have suffered loss going beserk, running amok (a Malay word) and randomly resorting to extreme violence.
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