insidiousness

/ɪnˈsɪdiəsnəs/
noun
  1. The quality of being gradual and harmful in a hidden way.
    • The insidiousness of the disease made it hard to detect until it was too late.
    • People often underestimate the insidiousness of everyday pollution.
    • The insidiousness of the propaganda lay in how reasonable it sounded at first.
  2. The quality of being deceitful or treacherous.
    • The movie captured the insidiousness of corruption in politics.
    • The insidiousness of the scheme was revealed when investors lost everything.
    • She saw through the insidiousness of his flattery.
What does "insidiousness" mean? | whatsthatwordmean | whatsthatwordmean