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insidious

Posted on February 18, 2016February 18, 2016 by admin

ihn sI di əs
adjective
1. dangerous through cunning, subtlety, and underhandedness. Their insidious plot included not only the assassination of President Lincoln but the killing of the Vice President and Secretary of State as well.
2. seemingly or outwardly harmless, but actually very dangerous. Glaucoma is an insidious disease that can damage a person’s eyes before causing any symptoms. 

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