Germany has historically vacillated between self-doubt and violent megalomania, with trouble defining itself as a nation.

Mr. Gephardt may also have trouble defining himself.

He too has trouble defining his claim on our attention.

He'd been eating it for so long that he had trouble defining the difference, but he knew it was there.

The next day it was pure joy unfiltered by human sense, and nothing could actually bother him, but...Louis had trouble defining his own feelings.

He had trouble defining the difference but, as with the colors of the fields, it was unmistakable.

With its elimination tournaments, college basketball had no trouble defining its champions - the Connecticut men and women.

I might be criticized for playing around too much," he admitted, "and I have trouble defining exactly what my style is.

Before information processing theory, psychologists had trouble operationally defining intelligence.

His agency is also responsible for preventing the dissemination of pornography, which like many arbiters of official taste he has trouble defining.