Hyper Dictionary

English Dictionary Computer Dictionary Video Dictionary Thesaurus Dream Dictionary Medical Dictionary

Search Dictionary:  

Meaning of INSIDIOUS

Pronunciation:  in'sideeus

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

INSIDIOUS is a 9 letter word that starts with I.


 Synonyms: dangerous, harmful, pernicious, seductive, subtle, unsafe



Webster's 1913 Dictionary
\In*sid"i*ous\, a. [L. insidiosus, fr. insidiae an
ambush, fr. insidere to sit in; pref. in- + sedere to sit:
cf. F. insidieux. See {Sit}.]
1. Lying in wait; watching an opportunity to insnare or
   entrap; deceitful; sly; treacherous; -- said of persons;
   as, the insidious foe. ``The insidious witch.'' --Cowper.

2. Intended to entrap; characterized by treachery and deceit;
   as, insidious arts.

         The insidious whisper of the bad angel. --Hawthorne.

{Insidious disease} (Med.), a disease existing, without
   marked symptoms, but ready to become active upon some
   slight occasion; a disease not appearing to be as bad as
   it really is.

Syn: Crafty; wily; artful; sly; designing; guileful;
     circumventive; treacherous; deceitful; deceptive. --
     {In*sid"i*ous*ly}, adv. -- {In*sid"i*ous*ness}, n.

Thesaurus Terms
 Related Terms: acute, amoral, arch, artful, astute, Byzantine, cagey, calculating, canny, chiseling, clever, collusive, conscienceless, corrupt, corrupted, covinous, crafty, criminal, crooked, cunning, cute, dangerous, dark, deceitful, deep, deep-laid, designing, devious, diplomatic, dishonest, dishonorable, doubtful, dubious, evasive, false, falsehearted, feline, felonious, finagling, fishy, foxy, fraudulent, furtive, gradual, guileful, ill-got, ill-gotten, immoral, indirect, ingenious, inventive, knowing, Machiavellian, Machiavellic, not kosher, pawky, perfidious, perilous, politic, questionable, ready, resourceful, rotten, scheming, serpentine, shady, shameless, sharp, shifty, shrewd, sinister, slick, slippery, sly, smooth, snaky, sneaky, sophistical, stealthy, strategic, subtile, subtle, supple, surreptitious, suspicious, tactical, treacherous, trickish, tricksy, tricky, two-faced, unconscienced, unconscientious, unconscionable, underhand, underhanded, unethical, unprincipled, unsavory, unscrupulous, unstraightforward, vulpine, wary, wily, without remorse, without shame