Fussy significance is rather hard to grasp. It refers to someone who is extremely meticulous and disapproving. A persnickety individual tends to be meticulous and sets the bar high when it comes to expectations and perfection. Their meticulousness can be seen as admirable, but it can also exacerbate unreasonable disapproval and unnecessary dissatisfaction. Being persnickety is frequently related to detailed focus on specifics but can also be seen as a form of obsessiveness.
