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Particular definition is quite hard to grasp. It refers to someone who is exceedingly selective and nitpicking. A persnickety individual typically nitpick and has high standards when it comes to criteria and flawlessness. Their fastidious nature can be seen as admirable, but it can also intensify unwarranted disapproval
and avoidable dissatisfaction. Being persnickety is frequently related to detailed attention to detail but can also be seen as a form of pedantry.