Insidiousness



[in-sid-ee-uh s] /ɪnˈsɪd i əs/

adjective
1.
intended to entrap or beguile:
an insidious plan.
2.
stealthily treacherous or deceitful:
an insidious enemy.
3.
operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect:
an insidious disease.
/ɪnˈsɪdɪəs/
adjective
1.
stealthy, subtle, cunning, or treacherous
2.
working in a subtle or apparently innocuous way, but nevertheless deadly: an insidious illness
adj.

1540s, from Middle French insidieux (15c.) or directly from Latin insidiosus “deceitful, cunning, artful,” from insidiae (plural) “plot, snare, ambush,” from insidere “sit on, occupy,” from in- “in” (see in- (2)) + sedere “to sit” (see sedentary). Related: Insidiously; insidiousness.

insidious in·sid·i·ous (ĭn-sĭd’ē-əs)
adj.
Being a disease that progresses with few or no symptoms to indicate its gravity.
in·sid’i·ous·ly adv.
in·sid’i·ous·ness n.

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