the world > action or operation > manner of action > vigour or energy > [noun] > briskness or activeness > bustle or fuss > one who bustles or fusses > one who fusses about trifles (4)
One who gives fussy attention to trifles.
A person who niggles (niggle, v.2); esp. a person who pays excessive attention to detail; a pedant. Also: †a dexterous person (obsolete).
a person or a thing employed in busy idleness.