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- Dictionaryinsidious/ɪnˈsɪdɪəs/
adjective
- 1. proceeding in a gradual, subtle way, but with very harmful effects: "sexual harassment is a serious and insidious problem"
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Insidious means gradually and secretly causing harm, especially to health or well-being. Learn how to use this adjective with examples from the Cambridge English Corpus and translations in different languages.
Learn the meaning of insidious, a word that can describe something harmful, deceitful, or subtle. See examples, synonyms, etymology, and related words of insidious.
The word insidious is used to describe something as being stealthy, treacherous, or operating in the shadows, as in He came up with an insidious plan to rob the jewelry store. Insidious is always associated with something negative, implying something is bad or is going to cause harm.
Insidious means gradually and secretly causing harm, especially something unpleasant or dangerous. Learn how to use this adjective with examples from different sources and languages.
Insidious means unpleasant or dangerous and developing gradually without being noticed. See synonyms, examples, word origin and usage in British and American English.
If something is slowly and secretly causing harm, it's insidious — like the rumors no one seems to listen to until suddenly someone's reputation is ruined. Insidious is related to the Latin noun, īnsidiae meaning "ambush" which comes from the Latin verb, īnsidēre "to lie in wait for."
Learn the meaning of insidious, an adjective that describes something harmful or treacherous that works in a subtle or stealthy manner. See synonyms, antonyms, origin, and examples of insidious in sentences.
