Home

Designed for school students & undergraduate entrance aspirants preparing for board exams, NEET, JEE and more.

JEE (Mains & Adv)NEET (UG)CBSE BoardISC BoardUP BoardCUET

Built for graduates & professionals targeting competitive exams — UPSC, CAT, GMAT, GRE, IELTS, banking & more.

GREGMATCATUPSCIBPSIELTSTOEFLSATACT

Core school & undergraduate subjects aligned with CBSE, ISC, UP Board, NEET and JEE syllabi.

PracticeMock TestsResources

Insidious

adjective | /insidious/

Essential WordsMEDIUM

Developing or operating gradually and subtly in a way that causes harm.

Learning Progress

Synonyms

stealthysubtletreacherous

Examples

"The disease had an insidious onset, with symptoms appearing gradually. Means: The disease began slowly and quietly, so its early symptoms were easy to miss."

"An insidious rumor spread through the office and damaged trust. Means: A harmful rumor spread subtly and gradually weakened people's trust."

Mnemonic Trick

An insidious danger sneaks in quietly and causes harm before it is noticed.

Source: Essential WordsAdded: 9/29/2026

Community Stats

Active Learners62
Words Being Learned107
Words Mastered246

Track Your Progress

Sign up to save your favorite words and track your learning progress across all vocabulary types.

Take your English vocabulary to the next level

Vocabulary Builder is a smart and comprehensive English vocabulary app designed to help you learn, remember, and master words effectively. Whether you are preparing for competitive exams or improving everyday English, the app goes beyond simple definitions to ensure deep understanding and long-term retention.

Get it on Google Play

We Value Your Privacy

Edvaya uses cookies to enhance your learning experience, analyze platform usage, and provide personalized content. You can customize your preferences or accept all cookies to continue.

By continuing, you agree to our Cookie Policy and Privacy Policy