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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
in·sid·i·ous    Audio Help   [in-sid-ee-uhs] Pronunciation Key
–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.
[Origin: 1535–45; < L insidiōsus deceitful, equiv. to insidi(ae) (pl.) an ambush (deriv. of insidére to sit in or on) + -ōsus -ous]

—Related forms
in·sid·i·ous·ly, adverb
in·sid·i·ous·ness, noun

—Synonyms 1. corrupting. 2. artful, cunning, wily, subtle, crafty.
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
Insidious

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American Heritage Dictionary - Cite This Source - Share This
in·sid·i·ous    Audio Help   (ĭn-sĭd'ē-əs)  Pronunciation Key 
adj.  
  1. Working or spreading harmfully in a subtle or stealthy manner: insidious rumors; an insidious disease.
  2. Intended to entrap; treacherous: insidious misinformation.
  3. Beguiling but harmful; alluring: insidious pleasures.


[From Latin īnsidiōsus, from īnsidiae, ambush, from īnsidēre, to sit upon, lie in wait for : in-, in, on; see in-2 + sedēre, to sit; see sed- in Indo-European roots.]

in·sid'i·ous·ly adv., in·sid'i·ous·ness n.
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The American Heritage® Dictionary of the English Language, Fourth Edition
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Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
insidious 
1545, from L. insidiosus "deceitful," from insidiæ (pl.) "plot, snare, ambush," from insidere "sit on, occupy," from in- "in" + sedere "to sit" (see sedentary).

Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
insidious

adjective
1. beguiling but harmful; "insidious pleasures" 
2. intended to entrap 
3. working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison" 

WordNet® 3.0, © 2006 by Princeton University.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Insidious

In*ses"sion\, n. [L. insessio, fr. insidere, insessum, to sit in. See Insidious.]

1. The act of sitting, as in a tub or bath. "Used by way of fomentation, insession, or bath." [R.] --Holland.

2. That in which one sits, as a bathing tub. [R.]

Insessions be bathing tubs half full. --Holland.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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