Definition of "insidiously" []

• In an insidious manner (adverb)

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• "-- Lecointre, our old Draper of Versailles, in these questionable circumstances, sees nothing he can do so safe as rise, 'insidiously' or not insidiously, and move, according to established wont, that the Robespierre Speech be 'printed and sent to the Departments.'"
• "This was an insidiously brilliant technique to focus our attention - by offering an open invitation for students to challenge his statements, he transmitted lessons that lasted far beyond the immediate subject matter and taught us to constantly checksum new statements and claims with what we already accept as fact."
• "Things have changed in many ways, but few things as dramatically or as insidiously as the manner in which we receive and process information."