Can you give me a unfamiliar word from Campaign Chaos (the Loud House: Chapter Book), Volume 3 - by Mollie Freilich and its definition

Answer 1

Sure! Here is an unfamiliar word from "Campaign Chaos" (the Loud House: Chapter Book), Volume 3 - by Mollie Freilich:

Word: Pernicious
Definition: Having a harmful effect, especially in a gradual or subtle way.