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Pernicious (Adjective)

Working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison".

All adjective clusters.

Exceedingly harmful.

All adjective clusters.

The pernicious effects of smoking have been well-documented and can lead to a range of serious health problems.
The pernicious influence of social media on teenagers' self-esteem has become a major concern for parents and educators.
The pernicious spread of misinformation on the internet can have serious consequences for individuals and society as a whole.
The pernicious legacy of colonialism continues to affect the economic and social development of many countries.
The pernicious habit of procrastination can hold people back from achieving their full potential and realizing their goals.