adjective. The definition of insidious is something or someone who works in a subtle or sly way, or in an intent to trap. An example of insidious is a plan that is meant to scam people out of money.

Subsequently, question is, what is the difference between insidious and pernicious? As adjectives the difference between insidious and pernicious. is that insidious is producing harm in a stealthy, often gradual, manner while pernicious is causing much harm in a subtle way.

Secondly, how do you use pernicious in a sentence?

pernicious Sentence Examples

The pernicious weed has spread all through the flower bed. In the war on terrorism and the role on HIV, the UNs role is equally pernicious. The last two had a pernicious effect on Cuba, draining it of horses, money and of men. He had pernicious anemia at age 49 years.

What is the synonym of pernicious?

pernicious(a.) Synonyms: hurtful, deleterious, injurious, detrimental, baneful, baleful, prejudicial, noxious, mischievous, damaging, disadvantageous, destructive, ruinous, fatal.