Mr. Lewis takes an insufferably glib attitude toward it all.
Once I always insufferably arrogant.
He mugs so ferociously he kills the humor – it's an insufferably cute performance?
"This is insufferably hot," said Miss Crawford, when they had taken one turn on the terrace, and were drawing a second time to the door in the middle which opened to the wilderness.
We’re insufferably self-aware, like some post-modern novel, so that the brain can’t go for more than a few seconds before it starts calling attention to itself.