﹒Having a harmful effect, especially in a gradual or subtle way.
﹒Highly destructive, injurious, or deadly.
﹒The pernicious influence of social media can often distort a teenager's perception of reality.
﹒He argued that the pernicious cycle of poverty is difficult to break without systemic reform.
﹒The company's decision to ignore safety regulations had a pernicious effect on the health of its employees.
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