"berserk" in the noun sense
1. 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
"berserk" in the adjective sense
1. amuck, amok, berserk
wildly frenzied and out of control
"the soldier was completely amuck"
"berserk with grief"
"a berserk worker smashing windows"
Source: WordNet® (An amazing lexical database of English)
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