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The current version of the vocabulary builder covers over 2720 words & is useful for students preparing for academic English examinations such as SAT, GRE, GMAT, etc. Now you can also listen to the pronunciation of words. - Refer a Friend.

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insidious (adj) slow but sure (the spread of a bad thing) harm or damage.

An insidious problem spreads slowly but surely causing a lot of harm or damage. Insidious pollution is pollution that spreads gradually in an unnoticeable manner and causes severe damage to the environment. An insidious trend spreads slowly but surely and causes a lot of damage to the existing system. Insidious changes take place slowly and destroy the existing system.

  • In spite of all safety measures, miners are exposed to insidious entry of silicon into their lungs casing serious lung disorders. They begin to feel the symptoms rather late.
  • The insidious propaganda has had the desired effect. It has changed the people’s attitude to their leader. That was the main purpose of the propaganda.
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Last Modified : 11-May 2009
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