insidious (C1)
adjective
Pronunciation: /ˌɪnˈsɪdiəs/
Definition
Stealthy, sneaky, and harmful, often in a way that is not immediately noticeable. Insidious actions or behaviors are designed to undermine or destroy something, such as a person's reputation or a system, by gradual and subtle means.
Examples
The insidious effects of the new policy were only apparent after several years.
The company's insidious marketing tactics were designed to manipulate consumers into buying more.
The insidious nature of the disease made it difficult to diagnose until it was too late.
How to Use insidious
- insidious plot (noun phrase)
- a sneaky or deceptive plan — "The insidious plot to overthrow the government was hidden behind a facade of innocence."
- insidious influence (noun phrase)
- a sneaky or subtle effect — "The insidious influence of social media on our self-esteem can be damaging."
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