Particular meaning is quite difficult to understand. It refers to someone who is extremely choosy and disapproving. A persnickety individual usually be fastidious and sets the bar high when it comes to expectations and flawlessness. Their fastidious nature can be perceived as commendable, but it can also exacerbate unwarranted censure and unnecessary dissatisfaction. Being persnickety is commonly linked to meticulous focus on specifics but can also be seen as a type of pedantry.