Definition of "insidiousness" [insidiousness]

• A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious. (noun)

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• "And this part of the -- I think you used the word insidiousness of the piece, that they laid that down like a bed of lettuce under the big salmon to demonstrate that this was a longstanding, or at least to intimate that this is a longstanding pattern of behavior, which is not so."
• "My mind wasn't changed but my eyes were opened to the insidiousness of the corporate lobby."
• "That something like his could still be written, and by a woman, seems to me the ultimate insidiousness - it sends a message to girls (the series is aimed at YA) that that is how they should want to be to get what they want."