fleeting

The fleeting existence of the quark pair above, like many virtual events, is represented by a Feynman diagram with a closed “loop.”

Fleeting moments are captured and stored, whether we want them to be or not.

Part of the problem is that its prevalence was equally as fleeting as a smile itself.

What had seemed immutable and eternal (“With the Soviet Union forever”) turned out to be a fleeting episode.

Those of us who live here are a fickle bunch with fleeting attention spans.

That fleeting comedic moment exemplifies Aidy Bryant at her best.

"You may call it that," retorted the elder man with a fleeting smile as Kirkwood slipped inside the dooryard.

I had a third fleeting chance, but absolutely could not grasp it.

The cause which the flag stands for may be foolish and fleeting; the love may be calf-love, and last for a week.

And the gifts of fortune when they come are fleeting except when they are made taut by intelligent adaptation of conditions.

He heard faintly the howling of the dogs, and had a fleeting thought that in the mastering of his flesh the frost no longer bit.