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1. Dictionary

   In·sid·i·ous

   /inˈsidēəs/

   

   adjective

   • 1. proceeding in a gradual, subtle way, but with harmful effects: "sexually transmitted diseases can be insidious and sometimes without symptoms"
   • ▪ treacherous; crafty: "tangible proof of an insidious alliance"

   Word Origin mid 16th century: from Latin insidiosus ‘cunning’, from insidiae ‘an ambush or trick’, from insidere ‘lie in wait for’, from in- ‘on’ + sedere ‘sit’.

   Derivatives

   • 1. insidiousness noun

   Scrabble Points: 10

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2. People also ask

   What does insidious mean?

   • The first two meanings may be applied to people or things (“an insidious enemy,” “an insidious plot”), while the last is usually applied to things (“insidious problems,” “insidious sexism”), in particular to the gradual progress of a disease (“an insidious malignancy”).

   Insidious Definition & Meaning - Merriam-Webster

   www.merriam-webster.com/dictionary/insidious

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   Where did the word insidious come from?

   • The first records of insidious come from around 1535. It comes from the Latin insidiōsus, meaning “deceitful.” The word insidious is often used in the media and popular culture to describe conspiracies, schemes, corruption, shadowy organizations, and other bad things that are done in secret.

   INSIDIOUS Definition & Meaning | Dictionary.com

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   Is “insidious” a bad word?

   • The obvious critical nature of this sentence suggests that “insidious” is something bad, andindeed it is, because it means “progressing or spreading in a harmful way”, a reader can probably guess that the tone or opinion of the following paragraph given by the writer explains that the word “insidious” has negative meaning.

   Reading Strategy: Guessing Unknown Words – I THINK SO

   itsme76109913.wordpress.com/2018/06/07/reading-strategy-guessing-unknown-words/

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   Where does the word 'insidieux' come from?

   • From Middle French insidieux, from Latin īnsidiōsus (“cunning, artful, deceitful”), from īnsidiae (“a lying in wait, an ambush, artifice, stratagem”) + -ōsus, from īnsideō (“to sit in or on”), from in (“in, on”) + sedeō (“to sit”). He experienced the insidious influence of the corporate culture. The spam is becoming more insidious.

   Insidious Definition & Meaning | YourDictionary

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3. www.merriam-webster.com › dictionary › insidiousInsidious Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › insidious

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   1. a. : having a gradual and cumulative effect : subtle. the insidious pressures of modern life. b. of a disease : developing so gradually as to be well established before becoming apparent. 2. a. : awaiting a chance to entrap : treacherous. b. : harmful but enticing : seductive. insidious drugs. insidiously adverb. insidiousness noun.

4. dictionary.cambridge.org › english › insidiousINSIDIOUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › english › insidious

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   adjective. us / ɪnˈsɪd·i·əs / Add to word list. (of something unpleasant or dangerous) gradually and secretly causing harm: Cancer is an insidious disease. insidiously. adverb us / ɪnˈsɪd·i·əs·li / His negative attitude slowly and insidiously spoiled the atmosphere around the office.

5. dictionary.cambridge.org › english › insidiousINSIDIOUS | definition in the Cambridge English Dictionary

   dictionary.cambridge.org › english › insidious

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   INSIDIOUS meaning: 1. (of something unpleasant or dangerous) gradually and secretly causing harm: 2. (of something…. Learn more.

6. www.dictionary.com › browse › insidiousINSIDIOUS Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › insidious

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   The word insidious is used to describe something as being stealthy, treacherous, or operating in the shadows, as in He came up with an insidious plan to rob the jewelry store. Insidious is always associated with something negative, implying something is bad or is going to cause harm.

7. www.vocabulary.com › dictionary › insidiousInsidious - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › insidious

   adjective. working or spreading in a hidden and usually injurious way. “glaucoma is an insidious disease” synonyms: pernicious, subtle. harmful. causing or capable of causing harm. adjective. intended to entrap. synonyms: dangerous, unsafe. involving or causing danger or risk; liable to hurt or harm. adjective. beguiling but harmful.

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9. www.collinsdictionary.com › english › insidiousINSIDIOUS definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › english › insidious

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   2 days ago · insidious in British English. (ɪnˈsɪdɪəs ) adjective. 1. stealthy, subtle, cunning, or treacherous. 2. working in a subtle or apparently innocuous way, but nevertheless deadly. an insidious illness. Collins English Dictionary.

10. www.yourdictionary.com › insidiousInsidious Definition & Meaning | YourDictionary

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    Beguiling but harmful; alluring. Insidious pleasures. American Heritage. Similar definitions. Synonyms: subtle. pernicious. underhanded. tricky. treacherous. snide. sneaky. devious. deep. deceitful. harmful. guileful.