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We found 40 dictionaries with English definitions that include the word insidious:
Click on the first link on a line below to go directly to a page where "insidious" is defined.

General dictionaries General (32 matching dictionaries)
  1. insidious: Merriam-Webster.com [home, info]
  2. insidious: Oxford Learner's Dictionaries [home, info]
  3. insidious: American Heritage Dictionary of the English Language [home, info]
  4. insidious: Collins English Dictionary [home, info]
  5. insidious: Vocabulary.com [home, info]
  6. insidious: Macmillan Dictionary [home, info]
  7. Insidious, insidious: Wordnik [home, info]
  8. insidious: Cambridge Advanced Learner's Dictionary [home, info]
  9. insidious: Wiktionary [home, info]
  10. insidious: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. insidious: V2 Vocabulary Building Dictionary [home, info]
  12. insidious: The Wordsmyth English Dictionary-Thesaurus [home, info]
  13. insidious: Infoplease Dictionary [home, info]
  14. insidious: Dictionary.com [home, info]
  15. insidious: Online Etymology Dictionary [home, info]
  16. insidious: UltraLingua English Dictionary [home, info]
  17. insidious: Cambridge Dictionary of American English [home, info]
  18. Insidious (Nightrage album), Insidious (film), Insidious (film series), Insidious: Wikipedia, the Free Encyclopedia [home, info]
  19. Insidious: Online Plain Text English Dictionary [home, info]
  20. insidious: Webster's Revised Unabridged, 1913 Edition [home, info]
  21. insidious: Rhymezone [home, info]
  22. Insidious: AllWords.com Multi-Lingual Dictionary [home, info]
  23. insidious: Webster's 1828 Dictionary [home, info]
  24. insidious: Hutchinson's Dictionary of Difficult Words [home, info]
  25. insidious: Free Dictionary [home, info]
  26. insidious: Hutchinson Dictionaries [home, info]
  27. insidious: Mnemonic Dictionary [home, info]
  28. insidious: WordNet 1.7 Vocabulary Helper [home, info]
  29. insidious: LookWAYup Translating Dictionary/Thesaurus [home, info]
  30. insidious: Dictionary/thesaurus [home, info]

Business dictionaries Business (1 matching dictionary)
  1. insidious: Legal dictionary [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. insidious: Encyclopedia [home, info]

Medicine dictionaries Medicine (5 matching dictionaries)
  1. insidious: online medical dictionary [home, info]
  2. Insidious: MEDLINE plus Illustrated Medical Encyclopedia [home, info]
  3. insidious: Medical dictionary [home, info]
  4. Insidious: University of Maryland Glossary of Medical Terms [home, info]
  5. Insidious: WeMove Glossary of Terms [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. insidious: Urban Dictionary [home, info]

(Note: See insidiousness for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (insidious)

adjective:  intended to entrap
adjective:  beguiling but harmful ("Insidious pleasures")
adjective:  working or spreading in a hidden and usually injurious way ("Glaucoma is an insidious disease")

▸ Also see insidiousness
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