errorgant

Adj. It means to be twice as certain as someone who is merely arrogant while possessing only one-tenth the requisite facts. Coined by Brandon Sanderson in “The Way of Kings”

The errorgant senator ignores every historical example of her tax plan failing even as the economists with multiple PhDs try to take her through it step-by-step.

Errorgance

To be twice as certain as someone who is merely arrogant while possessing only one-tenth the requisite facts.

In a typical display of errorgance Nigel extolled the imaginary benefits of losing Single Market membership to the assembled Vote Leave rally.