Unpurpose 

Business Term (Verb): To undermine the utility of a business meeting through participation, or to extinguish the meaning and impact of a presentation or letter by editing it or adding his own unsolicited thoughts.

Thanks to some stupid fucker inviting him, Kevin was able unpurpose the meeting in about five minutes

Unpurpose by The Working Dead July 10, 2016

unpreposessing 

Unpleasent to look at, undesirable, unappealing, or unattractive

Shut your unpreposessing face grandma!

unpreposessing by CtC May 30, 2014

unpurposely 

When something is not on purpose

"Omg! It was unpurposely that I said that thing!"

unpurposely by Alolysoly October 25, 2017