If his young apprentice's strength and enthusiasm flagged, the old master's never did.

I had worried that our boys would grow bored, but their enthusiasm never flagged.

As her enthusiasm flagged, the whole scene took on a nightmarish quality.

Despite the many difficulties he had encountered, his enthusiasm for this new life he had undertaken had not flagged.

Over the years, though, her enthusiasm, if not her faith, had flagged a little.

As enthusiasm flagged, there was also a change in the composition of the crowds, particularly the volunteers who agreed to be chefs.

In general, however, enthusiasm, sufficient at the start, quickly flagged.

But as the case has dragged on, she said, her enthusiasm for the fight has flagged.

The pace and enthusiasm flagged considerably when attention had to switch from abstract or grand designs to the nitty-gritty of practical details.

The Strauses may have the answer for those whose backhands and enthusiasm for tennis has flagged.