[1] : The Collaborative International Dictionary of English v.0.48

insidious \insid"ious\, a. l. insidiosus, fr. insidiae an
   ambush, fr. insidere to sit in; pref. in- + sedere to sit:
   cf. f. insidieux. see sit.
   1913 webster
   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.
      1913 webster

   2. intended to entrap; characterized by treachery and deceit;
      as, insidious arts.
      1913 webster

            the insidious whisper of the bad angel. --hawthorne.
      1913 webster

   3. acting or proceeding unobserved or in a seemingly harmless
      manner, but slowly or eventually doing great damage; as,
      an insidious disease; an insidious plot.
      pjc

   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. --
        insid"iously, adv. -- insid"iousness, n.
        1913 webster
see also:
sit insidious disease insid"iously insid"iousness 

Insidious >> I Words
Insidious, definition of term: Insidious
insidious_pag1.html

Disease >> D Words
Disease, definition of term: Disease
disease_pag1.html

Kidney Disease >> K Words
Kidney Disease, definition of term: Kidney Disease
kidney+disease_pag1.html

Skin Disease >> S Words
Skin Disease, definition of term: Skin Disease
skin+disease_pag1.html

Liver Disease >> L Words
Liver Disease, definition of term: Liver Disease
liver+disease_pag1.html

Lyme Disease >> L Words
Lyme Disease, definition of term: Lyme Disease
lyme+disease_pag1.html

Parrot Disease >> P Words
Parrot Disease, definition of term: Parrot Disease
parrot+disease_pag1.html

Jumping Disease >> J Words
Jumping Disease, definition of term: Jumping Disease
jumping+disease_pag1.html

Potts Disease >> P Words
Potts Disease, definition of term: Potts Disease
potts+disease_pag1.html

Heart Disease >> H Words
Heart Disease, definition of term: Heart Disease
heart+disease_pag1.html

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