Intoxicated by alcohol, or characterized by or resulting from drunkenness.
From Old English 'druncen', past participle of 'drincan' (to drink). The '-en' ending is an archaic past participle form that survives in few English words today.
The word 'drunken' preserves an ancient English grammar pattern - it's one of the few surviving '-en' past participles used as adjectives, like 'golden' or 'wooden', making it a linguistic fossil from Old English that continues to thrive in modern speech.
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