instupidity 

Both insanity and stupidity.

This relationship is instupidity to the nth degree.

instupidity by Ereck Flowers May 29, 2019

insipidity

1. dullness or lacking any qualities whatsoever that inspire, excite or stimulate

2. the #1 cause of blog death

Yeah, I use to read that blog until the guy became repetitive and proceeded to temporarily suspend and moderate the comments in order to completely silence legitimate, non-invective criticism. Too bad, isn't it? He killed his own blog with insipidity.

insipidity by RoyBoy3 May 12, 2010

Unstupiditynessish 

Of pertaining to a lack of stupidity

Wow Rebecca Louise Elizabeth Gales, you're so unstupiditynessish!

Unstupiditynessish by YourBestestFriendKLR April 4, 2010