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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 in·sid·i·ous /ɪnˈsɪdiəs/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 in·sid·i·ous /ɪnˈsɪdɪəs/ 形容詞

From: Webster's Revised Unabridged Dictionary (1913)

 In·sid·i·ous a.
 1. Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe. “The insidious witch.”
 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.

From: WordNet (r) 2.0

      adj 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"
         [syn: pernicious, subtle]