What is insidious?

Answer:

Insidious is to progress in a gradual, subtule way, but with harmful effects. Like STDs.

First answer by Cometster. Last edit by Cometster. Contributor trust: 8 [recommend contributor ]. Question popularity: 8 [recommend question].

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What is insidious about?
Insidious is about a boy who goes into a coma and his parents sees demons enter their house. So they call a psychiatrist to help them and she brings two ghost catchers. They then find out that it's...
Is insidious good?
Yes, it is very good, it's my favorite scary movie.
Is insidious PG13?
Yes
Insidious in a sentence?
The insidious disease seemed like just a harmless cold at first, but then killed its victims in the end.
What is the movie Insidious about?
Insidious is a horror movie that is based on a family that believes the house they live in now is haunted but actually it is the Son that was haunted and was being taken over by a demon while he was...