|1.||stealthy, subtle, cunning, or treacherous|
|2.||working in a subtle or apparently innocuous way, but nevertheless deadly: an insidious illness|
|[C16: from Latin insidiōsus cunning, from insidiae an ambush, from insidēre to sit in; see |
|a stew of meat, vegetables, potatoes, etc.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
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