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

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

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

He ignored that niggling doubt and jogged up the porch steps.

We knew she was good, but there's a niggling doubt until they do it.

A hook of niggling doubt snagged my stomach lining.

Disappointment stabbed her, spreading niggling doubt.

Yet, as with so much else this election cycle, a niggling doubt remains: maybe the conventional wisdom is wrong.

And there is always that niggling doubt about whether the North is the "rational" actor that MAD doctrine presupposes.

But while I'm certainly looking forward to seeing Aniston and Cox acting together again, I must also admit to a niggling doubt.

But he silenced the outcry, convinced himself he was making a wise decision, he was protecting Amy...and yet the niggling doubt remained, vociferous.

But then some niggling doubts started to creep in.

The play goes to some dark and harrowing places, and here I had some niggling doubts about the dramatic setup.

All-Ireland SFC Semi-final Dublin v Mayo: Despite their impressive progress to date Seán Moran looks at why some niggling doubts persist for Dublin.