inscrutable

If a person or their expression is inscrutable, it is very hard to know what they are really thinking or what they mean.

In some circumstences, it is important to keep a straight face and remain inscrutable.

inscrutable by Poljak November 14, 2007

instructables 

a website where people post plans and/or instructions for projects. Topics include transportation, photography, art, pets, technology, explosives, and more

I got burned when I made a rocket from plans off of instructables.

instructables by Alex Cole April 10, 2008

inscrutable

An inscrutable girl is one who'll make out, but not put out.

Mona and I got to third base, but she proved to be totally inscrutable.

inscrutable by scodder June 8, 2010

insertable 

a female hot enough to insert your penis into any of her various holes

Yeah, she's pretty insertable.

insertable by Jdatedotcom December 12, 2010

instable

Insane and unstable

Dylan is instable

instable by c_rain1234 March 27, 2017

Instopable 

Unable to be successfully stopped. A force so overwhelming that crushes all resistance. A Force that cannot be separated by the intended action unlike unstoppable which can fail, Instopable has a 100% success rate.

"The irony is that the reported damage by this instopable (as in indivisible) penetration by this class of high calliber military grade round was even questioned by ballistic experts." The round and it's intended damage are one in the same. Instopable!

Instopable by Mr_Charles March 2, 2019

Instable Computer 

A computer about to fall due to a bad surface it stands on - commonly comfused by newbs with Instable Operating System

Oh no! I have an instable computer - i should really move it to a place where it is less prone to falling.

Instable Computer by The Overmind July 6, 2004