Unhappenit 

1. To make something not happen
2. To take something back to its original state.

That whole relationship with him was shitty, I just want to unhappenit and move on.

Unhappenit by Widsoftcfo September 25, 2017

Unhappen

A word idiots use instead of undo

I'm going to make this problem and Unhappen

Unhappen by Kcah June 8, 2017

Unhappenable 

Synonym for impossible said incorrectly on purpose.

Kobe scored 81 points in a game!? That’s unhappenable!

Unhappenable by Cynical_F May 8, 2022

unhappienate 

See happienate. It's the opposite.

I hate Jill, and when I saw her delighted that John asked her out, I came up with a devious plan to unhappienate her - I killed John. With a butcher's knife. In the ass. I bet it hurt.

I think by smashing my train to pieces, I may have unhappienated it a little.

unhappienate by Jizzle January 12, 2005