The meaning of INSIDIOUS is having a gradual and cumulative effect : subtle. How to use insidious in a sentence. insidious, sinister, or pernicious?

INSIDIOUS definition: 1. (of something unpleasant or dangerous) gradually and secretly causing harm: 2. (of something…. Learn more.

operating or proceeding in an inconspicuous or seemingly harmless way but actually with grave effect. an insidious disease. The media could not be loaded, either because the server or …

Something that is insidious is unpleasant or dangerous and develops gradually without being noticed. The changes are insidious, and will not produce a noticeable effect for 15 to 20 years. …

1. Working or spreading harmfully in a subtle or stealthy manner: insidious rumors; an insidious disease. 2. Intended to entrap; treacherous: insidious misinformation. 3. Beguiling but harmful; …

spreading gradually or without being noticed, but causing serious harm. Definition of insidious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example …

Feb 15, 2025 · The word “insidious” describes something subtly harmful or deceitful, often spreading unnoticed before causing significant damage. It is commonly used for hidden …

dangerous through cunning, subtlety, and underhandedness. Their insidious plot included not only the assassination of President Lincoln but the killing of the Vice President and Secretary of …

Insidious is an adjective that describes something harmful or deceitful that is progressing in a gradual, subtle way, but with very harmful effects. It's often used to describe diseases that …

insidious (adjective) insidious /ɪn ˈ sɪdijəs/ adjective Britannica Dictionary definition of INSIDIOUS [more insidious; most insidious] formal : causing harm in a way that is gradual or not easily …