1. (adj)berserker, berserk one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury Synonyms: berserk, berserker Antonyms: sane
2. (adj)amuck, amok, berserk, demoniac, demoniacal, possessed(p) frenzied as if possessed by a demon Antonyms: sane