Demanding definition is reasonably elusive. It refers to someone who is exceedingly meticulous and critical. A persnickety individual tends to pay strict attention to detail and sets the bar high when it comes to standards and perfection. Their fastidious nature can be seen as admirable, but it can also intensify unreasonable criticism and superfluous dissatisfaction. Being persnickety is typically associated with precise attention to detail but can also be seen as a form of perfectionism.