Insidious disease
Insidious 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}.] [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. -- {In*sid"i*ous*ly}, adv. -- {In*sid"i*ous*ness}, n. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Insidious Disease — Allgemeine Informationen Genre(s) Black Metal, Death Metal Gründung 2004 Website …   Deutsch Wikipedia

  • Insidious — 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}.] [1913 Webster] 1. Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous;… …   The Collaborative International Dictionary of English

  • insidious — [in sid′ē əs] adj. [L insidiosus < insidiae, an ambush, plot < insidere, to sit in or on, lie in wait for < in , in + sedere, to SIT] 1. characterized by treachery or slyness; crafty; wily 2. operating in a slow or not easily apparent… …   English World dictionary

  • insidious — insidiously, adv. insidiousness, n. /in sid ee euhs/, adj. 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… …   Universalium

  • insidious — in•sid•i•ous [[t]ɪnˈsɪd i əs[/t]] adj. 1) intended to entrap or beguile: an insidious plan[/ex] 2) stealthily treacherous or deceitful: an insidious enemy[/ex] 3) operating or proceeding inconspicuously but with grave effect: an insidious… …   From formal English to slang

  • insidious — /ɪnˈsɪdiəs / (say in sideeuhs) adjective 1. intended to trap or deceive: an insidious plot. 2. stealthily treacherous or deceitful: an insidious enemy. 3. operating or proceeding inconspicuously but with grave effect: an insidious disease. {Latin …   Australian English dictionary

  • insidious — Treacherous; stealthy; denoting a disease that progresses gradually with inapparent symptoms. [L. insidiosus, cunning, fr. insidiae (pl.), an ambush] * * * in·sid·i·ous in sid ē əs adj developing so gradually as to be well established before… …   Medical dictionary

  • insidious — adjective a) Producing harm in a stealthy, often gradual, manner. Strong and vigorous man as he looks, Livingstone has been for years the victim of a secret and insidious disease. b) Intending to entrap; alluring but …   Wiktionary

  • insidious — adj. 1 proceeding or progressing inconspicuously but harmfully (an insidious disease). 2 treacherous; crafty. Derivatives: insidiously adv. insidiousness n. Etymology: L insidiosus cunning f. insidiae ambush (as IN (2), sedere sit) …   Useful english dictionary

  • insidious — adjective Etymology: Latin insidiosus, from insidiae ambush, from insidēre to sit in, sit on, from in + sedēre to sit more at sit Date: 1545 1. a. awaiting a chance to entrap ; treacherous b. harmful but enticing ; seductive …   New Collegiate Dictionary

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