insidiot 

A person who at first appears to be normal but who gradually, over time, reveals himself or herself to be nothing more than an idiot. Derived from a merging of the words "insidious" and "idiot".

"The guy sitting beside me on the plane seemed like a cool guy, but the more he kept talking, I came to realize that he was nothing more than an insidiot"

insidiot by fredogonefishin May 14, 2014

insidiot 

A person who knowingly acts in a devious and treacherous way to sabotage another person's well-being while simultaneously putting their own well being at risk.

The insidiot did everything in her power to ruin her ex-husband's business with no regard for the ill-effects it would have on her financial health.

insidiot by KMUSE July 25, 2013

Inspdiot

When either kids, or parents who are complete failures; watch inspirational movies which they think boosts up their energy and they think they're actually going to change their jobs and lives (parents) and the kids will think they'll be some really famous person and a success in life. We all know this boost of inspiration will last for about 1 hour, but we smile at those idiots anyway.

Mom: That was a such great inspirational movie! Now I'm inspired to quit my job, and find a job 10x better!

Me: Keep dreaming you Inspdiot.

Inspdiot by Rll19 June 19, 2009

insidious 

Insidious (adverb insidiously)

developing in a very gradual, in a stealthy manner, with the intend of causing damage.

Prostate Cancer is an insidious disease.

insidious by piece September 18, 2006

Insidiosity

The action of having a large or long wood

His wood is large beyond comprehension, it’s insidiosity.

Insidiosity by Smoked Paprika August 16, 2021

Insidious 

A scary film

Just watched Insidious it was shit scary

Insidious by xizzie3 October 27, 2011

insidiotic 

Used to describe something or someone that is both insane and idiotic. Created April 2007 in Decatur, IL at the Decatur Herald & Review Newspaper.

It's hard to tell just how insidiotic Rick James was, but "Super Freak" will always be pure genius.

insidiotic by afiliatx67 July 6, 2007