Stubbnorant 

- adjective - A single word which encapsulates the three essential aspects of someone who thinks they are smarter than the rest of us, but the rest of us know better: 1. Stupid; 2. Stubborn; 3. Ignorant. Variants would include: stubbnorance, stubbnorancity.

No matter how smart that manager thinks she is, she's the most stubbnorant individual I've ever met.

Stubbnorant by deezledubb December 24, 2013

stugnorant 

Being determined to an opinion that you know nothing about

Joe: I think that Earth isn't round
Bob: But science says that-
Joe: HISTORY CHANNEL SAID SO B*TCH LAY OFF
Bob: Dude, quit being so stugnorant, the Earth is round.

stugnorant by Rzrbak98 December 21, 2016