Persnickety definition is rather elusive. It refers to someone who is exceedingly choosy and fault-finding. A persnickety individual frequently be meticulous and has high standards when it comes to criteria and flawlessness. Their fastidious nature can be seen as admirable, but it can also exacerbate unreasonable disapproval and avoidable dissatisfaction. Being persnickety is commonly related to meticulous attention to detail but can also be seen as a type of perfectionism.