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We found 39 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 (31 matching dictionaries) insidious: American Heritage Dictionary of the English Language [home, info] insidious: Collins English Dictionary [home, info] insidious: Vocabulary.com [home, info] insidious: Macmillan Dictionary [home, info] insidious: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Insidious, insidious: Wordnik [home, info] insidious: Cambridge Advanced Learner's Dictionary [home, info] Insidious: Wiktionary [home, info] insidious: Webster's New World College Dictionary, 4th Ed. [home, info] insidious: V2 Vocabulary Building Dictionary [home, info] insidious: The Wordsmyth English Dictionary-Thesaurus [home, info] insidious: Infoplease Dictionary [home, info] insidious: Dictionary.com [home, info] insidious: Online Etymology Dictionary [home, info] insidious: UltraLingua English Dictionary [home, info] insidious: Cambridge Dictionary of American English [home, info] Insidious (Mephisto Walz album), Insidious: Wikipedia, the Free Encyclopedia [home, info] Insidious: Online Plain Text English Dictionary [home, info] insidious: Webster's Revised Unabridged, 1913 Edition [home, info] insidious: Rhymezone [home, info] Insidious: AllWords.com Multi-Lingual Dictionary [home, info] insidious: Webster's 1828 Dictionary [home, info] insidious: Hutchinson's Dictionary of Difficult Words [home, info] insidious: Free Dictionary [home, info] insidious: Hutchinson Dictionaries [home, info] insidious: Mnemonic Dictionary [home, info] insidious: WordNet 1.7 Vocabulary Helper [home, info] insidious: LookWAYup Translating Dictionary/Thesaurus [home, info] insidious: Dictionary/thesaurus [home, info] Business (1 matching dictionary) insidious: Legal dictionary [home, info] Computing (1 matching dictionary) insidious: Encyclopedia [home, info] Medicine (5 matching dictionaries) insidious: online medical dictionary [home, info] Insidious: MEDLINE plus Illustrated Medical Encyclopedia [home, info] insidious: Medical dictionary [home, info] Insidious: University of Maryland Glossary of Medical Terms [home, info] Insidious: WeMove Glossary of Terms [home, info] Slang (1 matching dictionary) insidious: Urban Dictionary [home, info]

Quick definitions from Macmillan ( ) Provided by 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") ▸ Word origin