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Perniciously (Adverb)

In a harmfully insidious manner; "these drugs act insidiously".

The new pesticide spread perniciously through the ecosystem, decimating the local wildlife population.
The company's financial troubles were perniciously affecting employee morale, making it harder to maintain productivity.
His addiction had taken hold perniciously, slowly destroying his relationships and overall well-being.
The new disease was spreading perniciously throughout the city, catching many residents off guard.
The politicians' lies were being disseminated perniciously through social media, influencing public opinion in negative ways.

In a noxiously baneful way; "this banefully poisoned climate".

The company's wasteful practices were perniciously harming the environment and local wildlife.
His negative thoughts perniciously crept into every waking moment, making it difficult for him to find peace.
The perniciously false information on the internet can be a damaging influence on uninformed readers.
Their greed perniciously fueled a cutthroat business environment where morality was a rare commodity.
Unhealthy habits can perniciously erode a person's well-being if not addressed and corrected early on.