untenable 

1 Something that someone tells you and they can't prove it.

2 Unable to substantiate with solid evidence.

3 unprovable

Example 1

Teacher: Give me your homework.

Student: Here's my homework; (pretends to hand it over) I wrote it on magic paper that only wizards can see and touch.

Teacher: That excuse is untenable. You still get a zero and detention.

Example 2

Person A: I'm telling you; Jesus really exists in the communion wafers of the Eucharist. Transubstantiation is irrefutable because sacred scripture and church doctrine supports it.

Person B: No, That's not irrefutable, that claim is untenable! The church has no palpable proof themselves, only St. Thomas Aquinas's word games. All that faith in your head has mushed the brain out of your ears.

Person A: Heathen! You know in your heart that God is real and that he loves you!

Person B: That's also untenable. But I'm not saying that I can prove you to be wrong.

untenable by Elvidse December 18, 2009

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

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

Unrailable  

When a bitch is so nasty that even if you're completly drunk you wouldn't rail her.

"Omg Cindy is such a slut, I'm wasted but still she's Unrailable ."

Unrailable by E-glue July 27, 2008

Unrelated Wizards

A Harry Potter role-playing site, Unrelated Wizards was created when a group of people would spam the comment section of photos on the website Unrelated Captions pretending to be characters . They were then yelled at by Unrelated Captions's Admin. The group decided they must form their own website, and elected the one who called himself "Remus Lupin" to do so, which he painstakingly did. The Unrelated Wizards now spend their time having parties on their forum

Quoted from the site:
Founded by a group of rebels who would take over the comments of photos with unrelated captions, Unrelated Wizards is a website. That's all I have to say.

Unrelated Wizards by Remus John Lupin March 29, 2010

Unreliable texter 

A person who texts unreliably; they can either respond in ten minutes or ten days. Also quality of texts are unpredictable. They are either short one words or paragraphs.

Oh yeah you know Courtney? She’s such an unreliable texter! She hasn’t responded in a week!

Unreliable texter by CTwister February 2, 2023

pic unrelated 

Famous statement on 4chan.org, used by people, or OPs who request a picture but just want to dump random images of their own with nothing to do with the request. By saying "pic unrelated" at the end of the post, you are automatically excused for posting something with nothing to do with what you requested

4chan user: Anyone have any Team fortress 2?
In 1920x1080 preferably
Pic unrelated

pic unrelated by yobrova December 13, 2009