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Idiocy
Negative Connotation
'Idiocy' carries a strong negative feeling; use it to express clear disapproval of someone's actions or ideas. 
Context Matters
Use 'idiocy' when discussing topics where intelligence or good judgement are expected, to highlight a failure in these areas. 
Often Hyperbolic
'Idiocy' can be used for emphasis or exaggeration; not always meant literally. 