presumido 英語で:

The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.

What are you looking so smug about?

smug as a fly in shit

he was feeling smug after his win.|. She deserved her promotion, but I wish she wasn't so smug about it.

And they use smug left-wing arguments about political correctness to feed their voters' sense of being looked down on.