Insidious

Pronunciation: /ˌɪnˈsɪˌdiːəs/

Insidious (adj)

  1. Causing harm in a slow, quiet way, often without people noticing at first.
  2. Having a gradual, unnoticed effect that spreads and becomes stronger over time.
  3. Dangerous in a way that is hard to see or measure at once.

Insidious (adjective)

Examples

  • Smoking can have an insidious hidden harmful effect over time.
  • The chemical has an insidious hidden harmful effect that people ignore.