[{"Bold_text": "adjective", "List Items": ["violently or destructively frenzied; wild; crazed; deranged:He suddenly went berserk.Synonyms: lunatic , demented , rabid , maniacal , mad , violent Antonyms: calm , rational"]}, {"Bold_text": "noun", "List Items": ["(sometimes initial capital letter)Scandinavian Legend.Alsoberserker.an Norse warrior who fought with frenzied rage in battle, possibly induced by eating hallucinogenic mushrooms."]}]