Particular definition is rather elusive. It refers to someone who is immensely picky and nitpicking. A persnickety individual tends to nitpick and sets the bar high when it comes to standards and flawlessness. Their meticulousness can be seen as admirable, but it can also intensify
overly demanding censure and avoidable dissatisfaction. Being persnickety is typically associated with thorough focus on specifics but can also be seen as a type of obsessiveness.
