disappointmate 

someone who constantly disappoints his/her mates

Ex: I heard John shagged Mark's girlfriend. He's a fuckin' disappointmate!

disappointmate by P3NNY69 January 4, 2017

Disappointation 

Highly disappionted in many people

This feeling is disappointation

Disappointation by A_Random_Dude_ May 29, 2019

disappointation 

When one is so disappointed that the word disappointed cannot contain it all.

Sophie fails to complete the requests of The Steve. Steve becomes more then disappointed, he becomes disappointation.

disappointation by That Guy3000 January 18, 2011

Disappointationated 

The feeling of being disappointed. In a modern way of fun language. ;)

- Shahed SFSSA ;)

“You made me disappointationated”

Disappointationated by Defdef362839 August 16, 2018

Disappointationated 

The feeling of being disappointed. In a fun way if modern language. :)

Patented by- Shahed SFSS

“You made me disappointationated”

Disappointationated by Defdef362839 August 16, 2018

Disappointation 

Very disappointed

Disappointation

Disappointation by dinkleburgason June 6, 2023