And there's the niggling question of some five million "lost" e-mails from 2003-2005, whose fate remains uncertain.

So there was another niggling question: how large a part was Nnanji destined to play in Shonsu's quest?

Back to that niggling question: why intervene?

Literary theorists long ago deemed it vulgar to fixate on niggling questions of plot.

But no old spy steps down without loose ends, unclosed files, niggling questions.

There are, however, some other niggling questions about Brown's dyslexia, assuming it's a condition and not a one-off panic-induced lapse.

But he has answered even the most niggling questions with the good humor of a man most decidedly on vacation.

Was I ready to risk my position in the patrol over a foolish, niggling question?

Depending on the general frame of mind in which a film puts us, we may or may not be inclined to ask niggling questions.

I bet no one needed the niggling question: "When you say a billion, is that a trillion?"