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﹒Proceeding in a gradual, subtle way, but with harmful effects.
﹒Treacherous or crafty; working or spreading in a hidden and usually injurious way.
﹒The insidious nature of the disease meant that it went undetected for years.
﹒He realized too late that the insidious influence of his coworker was slowly ruining his reputation.
﹒The software contained an insidious virus that quietly corrupted all of his important files.
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