dullingest 

Something that is very uninteresting/lacks the very most, or the least sharpest.

(Adjective for Dull.)

"This is the most dullingest activity in the entire planet!"

"My carving knife is next to the most dullingest thing ever!"

dullingest by Chukoloco08 February 19, 2022

dumbingest 

When someone says something so unbelievably stupid and unheard of, that there is simply no dumber solution to a problem that could have been suggested. Mostly used in political disagreements.

Suggesting that we simply rid American health care of insurance companies and allow doctors to fight for business directly with patients (with no safety net of long term or intensive care) is the dumbingest solution to the US healthcare crisis I've ever heard.

dumbingest by BruceLeah July 24, 2017