unreliable 

undependable, irresponsible, untrustworthy

James : Andy has bailed again he is now on punishment
Nick : You know baldy he is unreliable

unreliable by yittybum June 30, 2011

Uneffable 

Someone who is so indescribably unattractive that it is impossible to fuck them.

"I've thought about it dude, but she isn't just ugly, she's mean. Totally uneffable."

Uneffable by Matty B Good May 19, 2009

Undeniable

When something just absolutely not be denied from obtaining a success

Thomas Jefferson High School for Science and Technology is undeniable

Undeniable by anotherasianguy2013 October 29, 2011

geographically undesirable

Also Abbrev. as GA

1) When a potential mate / dating prospect lives at a distance.

2) A job prospect in a location where you don't want to live.

1) e.g. I live in New York, She lives in England... she's cute, but she's completely geographically undesirable.

2) e.g. They offered me $120k for the position, but there's no chance I'm moving to French Lick, Indiana. That's way too G.A.

geographically undesirable by urbanVirus July 16, 2006

Unreliable, untestable truth

The embodiment of faith.

Oh, you have faith do you?

The next time you feel compelled to use the word 'faith', why don't you try replacing it with: 'pretending to know something that I really don't know''.
If you really want to keep it simple you could just say: 'I have unreliable, untestable truth'.

Unreliable, untestable truth by YAWA October 31, 2017

undesirable number 1 

Harry Potter in Harry Potter and the Deathly Hallows.

Harry Potter is Undesirable Number 1.

undesirable number 1 by Claire YAAAAAAAAy September 14, 2007

Geographically Undesirable

Most commonly referred to as "G.U.", geographically undesirable is someone who you would like to date, but the fact that they live so darn far away is a problem.

She wanted to date him, but he was Geographically Undesirable since he lived in Santa Barbara and she lived in San Diego.

Geographically Undesirable by MissCB January 6, 2007