You searched for: “most insidious
insidious (adjective), more insidious, most insidious
1. Relating to an intension to entrap, to beguile, or to allure someone into a treacherous situation: Henry's cousin has an insidious plan to steal a woman's purse after she leaves the bank.
2. Stealthily treacherous or deceitful: The military commander told his staff that they were fighting an insidious enemy.
3. A reference to something that proceeds in an inconspicuous, subtle, stealthy, or seemingly harmless way, but which actually has a serious negative effect: Jim had an insidious disease which existed for some time, but even his physician was not aware of what was causing it.

Sometimes people have an insidious ailment, but they have no idea that they are infected.

4. Etymology: From Latin insidiosus, "deceitful", from insidae (plural) "plot, snare, ambush", from insidere, "to sit on, to occupy" from in-, "in" + sedere "to sit".
Crafty while operating secretly to deceive someone.
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Treachery performed in a sly way.
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This entry is located in the following units: -ous, -ious, -eous (page 12) sed-, sedat-, -sid, -sess (page 2)
Word Entries at Get Words: “most insidious
Conveying a treacherous, deceitful, and crafty operation or plot for a dishonest purpose. (2)