Everything from diet to niggling little health problems could be causing problems.

I need it ASAP. The U.S. case had left a niggling fear.

Unfortunately, the beauty of the concept is marred by two niggling problems.

But no matter how much sense I made, the niggling had started.

Yet there was something niggling about Elder's demeanor, a small discordant something.

So why did I still have a niggling doubt in my mind?

The niggling feeling he's articulating has been at him for some time.

So he picked another niggling doubt at the back of his mind.

And I'm not in a state to go on niggling about it.

But any little niggling scruple is more to you than I am.

We've had a few niggling injuries but they have been rectified now.

Miller nodded, but something was niggling at the back of his mind.

Well, then there was that niggling business over why he had returned.

All United had to comfort themselves was finally beating a niggling rival.

But I could never quite remove the niggling doubt, you know?

Weeding out niggling problems is not unusual for ambitious, budding businesses.