unfunctionable 

inability to function properly

She blew me so hard I was completely unfunctionable for hours afterwards.

unfunctionable by lcritterl January 14, 2008

Unfucktionable 

Something that doesn't perform with it's intended purpose and is really fucking annoying

This kimono is really unfucktionable

Unfucktionable by Darmonatrix February 16, 2015

unfunctional 

Something that does not function or work. The opposite meaning of the word functional.

Dude my eyes don’t work! They’re unfunctional!

unfunctional by Maverick Fischer April 5, 2022