Fussy definition is quite elusive. It refers to someone who is extremely meticulous and judgmental. A persnickety individual usually be meticulous and has high standards when it comes to standards and perfection. Their fastidious nature can be perceived as commendable, but it can also magnify extreme censure and unjustified dissatisfaction. Being persnickety is frequently linked to precise attention to detail but can also be seen as a form of pedantry.