per
ni
cious
Comparative
more pernicious
Superlative
most pernicious
1
causing great harm or damage, often in a gradual or unnoticed way
- The pernicious effects of smoking may take years to appear.
- Social media can have a pernicious influence on young minds.
- The pernicious weed spread across the farmland, destroying crops.
- His pernicious lies damaged her reputation beyond repair.
- Poverty has a pernicious impact on education and health.