Origin of Insidious
From Middle French insidieux, from Latin īnsidiōsus (“cunning, artful, deceitful”), from īnsidiae (“a lying in wait, an ambush, artifice, stratagem”) + -ōsus, from īnsideō (“to sit in or on”), from in (“in, on”) + sedeō (“to sit”).
From Latin īnsidiōsus from īnsidiae ambush from īnsidēre to sit upon, lie in wait for in- in, on in–2 sedēre to sit sed- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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