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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; < Latin insidiōsus deceitful, equivalent to insidi(ae) (plural) an ambush (derivative of insidēre to sit in or on) + -ōsus -ous
1535–45; < Latin insidiōsus deceitful, equivalent to insidi(ae) (plural) an ambush (derivative of insidēre to sit in or on) + -ōsus -ous
Related forms
in·sid·i·ous·ly, adverb
in·sid·i·ous·ness, noun
un·in·sid·i·ous, adjective
un·in·sid·i·ous·ly, adverb
un·in·sid·i·ous·ness, noun
Synonyms
1. corrupting. 2. artful, cunning, wily, subtle, crafty.
1. corrupting. 2. artful, cunning, wily, subtle, crafty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Insidious
is always a great word to know.
So is doohickey. Does it mean:
| a gadget; dingus; thingumbob. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
Collins
World English Dictionary
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
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, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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