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Insidious

/ɪnˈsɪdi.əs/

Producing harm in a stealthy, often gradual, manner.

Full Dictionary Entry

📖 Definitions of "Insidious"

adjective
  1. 1

    Producing harm in a stealthy, often gradual, manner.

  2. 2

    Intending to entrap; alluring but harmful.

    "Hansel and Gretel were lured by the witch’s insidious gingerbread house."

  3. 3

    Treacherous.

    "The battle was lost due to the actions of insidious defectors."

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