A foolish or stupid person; a simpleton (Irish dialect).
From Irish 'amadán,' derived from Old Irish roots meaning 'silly' or 'foolish.' The word has been used in Irish English for centuries to playfully insult someone's intelligence.
This Irish word stuck around in English dialects for 500+ years because it's just fun to say—Irish speakers loved its rhythm so much that English speakers borrowed it wholesale, the way we steal good insults from every language we meet.
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