Smug – Showing an excessive pride
The smuggler (smug) had excessive pride in himself and his achievements - instead he should have been ashamed of the crimes he'd committed.
Examples of smug in a sentence
Now don't get smug just because you've won a couple of games.
There was a hint of smug self-satisfaction in her voice.
She deserved her promotion, but I wish she wasn't so smug about it.