[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/dictionaries/school/w/insidious.html)

[home](https://md.mova.elamur.ai/free/en/) / [dictionaries](https://md.mova.elamur.ai/free/en/dictionaries/) / [The school dictionary](https://md.mova.elamur.ai/free/en/dictionaries/school/) / insidious

[← I](https://md.mova.elamur.ai/free/en/dictionaries/school/I/)

# insidious

«insidious» in Mova's school dictionary: **harmful in a sneaky way that works slowly and is hard to…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

adjective

### meaning for a pupil

1) Insidious means harmful in a sneaky way that works slowly and is hard to spot. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/#m1)

2) An insidious person pretends to be a friend while secretly planning harm. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/#m2)

### sense in the lessons

in tales a wicked adviser whispers lies to a king; in everyday life a habit that does damage without you noticing

### examples

- The insidious fog crept into every room. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/#x1)
- The wolf's insidious plan fooled the whole village. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/#x2)
- Lies can be insidious because they spread quietly. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/#x3)

### note

nothing for maths

### Trees and pragmatics

[Every meaning and example of «insidious» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/insidious/), each sentence with its dependency tree and frames.