The worry nagged at him but he dismissed it--we were both pretty freaked-out, we might have done anything, and hardly been conscious of it.

Now it was suddenly clear that a darker worry nagged the agent.

Although, deep inside, the worry and fear still nagged and scratched at my thoughts.

A faint worry nagged at Hull's face.

Only one small worry nagged at her: what if the vengeful Pona could prejudice her grandfather.

Only one small worry nagged at her: what if the vengeful Pona could prejudice her grandfather, Lord Sangel, against a lowly apprentice in the Craft Hall?

That worry frustrated his attempts at sleeping and nagged at him before the meeting.

A worry nagged.

Instead, worries nagged me.