niggle

Do you not have even the slightest worry about the ethical implications of your experiments?

I felt a slight niggle of doubt before starting the project.

He had a small niggle about the success of the venture.

I have a few minor niggles about this report, but overall it is well-written.

Despite a few niggles, I enjoyed the movie.

She had a few niggles about the service at the restaurant.

I can't seem to remember his name, and it has been niggling me for weeks.

The issue kept niggling at him, making him feel uneasy.

Something had been niggling at her mind.

She constantly niggles over the precise pronunciation.

The manager keeps niggling me about the details in my report.

He was niggling about my choice of words in the presentation.