This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Destructively or frenetically violent: a berserk worker who started smashing all the windows.

adj. Mentally or emotionally upset; deranged: berserk with grief.

adj. Informal Unrestrained, as with enthusiasm or appetite; wild: berserk over chocolates.

n. One that is violent, upset, or unrestrained.

n. A berserker.

n. A crazed Norse warrior who fought in a frenzy.

adj. Injuriously, maniacally, or furiously violent or out of control.

n. One of a class of legendary heroes, who fought frenzied by intoxicating liquors, and naked, regardless of wounds.

n. One who fights as if frenzied, like a Berserker.

adj. frenzied; crazed; usually in predicate position.

n. Same as berserker.

n. one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury

adj. frenzied as if possessed by a demon

""You know he's a Scot; men of that country are" - I tried to think of a good synonym for "berserk" - "most fierce where questions of their honor are concerned.""

insane    berserker   

Norse    Scandinavian    Northman   

Úlfhéðinn   

berserker   

frenzied    crazed   

Berk    Burk    Burke    Dirk    Kirk    Merc    Turk    berk    birk    burke   

berserker    type    ungovernable    uninhabitable    inoperable    certifiable    addle    maniacal    illegible    homicidal