Insidiousness

Pronunciation: /ˈˌɪnsɪˌdiəsˈnɛs/

Insidiousness (noun)

  1. The quality of being harmful in a quiet, gradual way, often without people noticing at first.
  2. The state of acting in a secret, indirect way that causes harm or unfair results over time.

Examples

  • The insidiousness of the disease made early symptoms easy to miss.
  • Her report warned about the insidiousness of the chemical leak.