Persnickety Definition Meaning MerriamWebsterFussy definition is reasonably tricky to comprehend. It refers to someone who is vitally particular and nitpicking. A persnickety individual tends to be fastidious and sets the bar high when it comes to criteria and perfection. Their attention to detail can be seen as admirable, but it can also lead to excessive censure and unjustified dissatisfaction. Being persnickety is commonly connected with exact attention to detail but can also be seen as a type of perfectionism.