Insidious
/ɪnˈsɪdiəs/
Definitions
Proceeding or spreading in a gradual or subtle way but with harmful effects.
/ɪnˈsɪdiəs/
Proceeding in a gradual, subtle way, but with harmful effects.
The insidious nature of the disease made it difficult to detect.
💡 Simply: Imagine a problem that's like a sneaky friend. They start off being nice, but slowly and secretly cause you trouble. Think of a tiny crack in a dam; it looks harmless at first, but over time it can cause a flood.
👶 For kids: When something is insidious, it means it's sneaky and slowly causes harm, like a hidden danger.
More Examples
He was wary of the insidious charm of the con artist.
The insidious influence of social media on young people's mental health is a growing concern.
How It's Used
"The disease had an insidious onset, with symptoms appearing slowly over several months."
"The dictator used insidious propaganda to control the population."
"The author described the insidious spread of corruption within the company."
From Latin *īnsidiōsus* (“wily, treacherous”), from *īnsidiae* (“an ambush, a snare”), from *īnsidēre* (“to lie in wait for”).
The word gained prominence in the 17th and 18th centuries, often used to describe illnesses, political movements, and moral decay.
Memory tip
Think of an "inside-the-seed" (in-sidious) problem, starting small and growing to become a big issue. Like a tiny seed of doubt or disease.