INSIDIOUS definition: 1. (of something unpleasant or dangerous) gradually and secretly causing harm: 2. (of something…. Learn more. Insidious means working or spreading harmfully in a subtle or stealthy manner, or intended to entrap or beguile. Find out the origin, usage, and translations of this adjective, and see examples and related words. Master the word " INSIDIOUS " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Learn the meaning , pronunciation and usage of the adjective insidious , which means spreading gradually or without being noticed, but causing serious harm. See examples, synonyms and word origin.

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