But he became overconfident and closed too soon.

During this time, John Stewart has become increasingly overconfident and builds a new Anti-Life Catcher with his ring.

And then, as they went on, they became overconfident and started doing things that are not always in our best interests".

However, Peter becomes slightly overconfident due to Spider-Man's success.

Not receiving any return fire, he became overconfident and ventured inside.

This resulted in Stalin becoming overconfident and deciding to further expand the offensive.

The Albanian forces had become overconfident and lulled into a false sense of security.

Unaware of the dangers involved in a Kaijudo duel, Hakuoh became overconfident and was nearly killed as a result.

He became overconfident and reckless, and was captured by a warlord called Al Kadhdhaab.

Possibly he was becoming smug or overconfident but here, I believe, he goofed badly.