working or spreading in a hidden and usually injurious way
- Pernicious propaganda.
- Pervasive and pernicious deviations from both fact and logical validity lurked behind a meretricious plausibility.
- I think that the romantic myth is one of the most pernicious of our times.
- The Displacement of the idea that facts and evidence matter, by the idea that everything boils down to subjective interests and perspectives is — second only to American political campaigns — the most prominent and pernicious manifestation of anti-intellectualism in our time.