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Choosy meaning is fairly elusive. It refers to someone who is exceptionally particular and disapproving. A persnickety individual typically pay strict attention to detail and does not settle for less when it comes to standards and excellence. Their attention to detail
can be regarded as praiseworthy, but it can also intensify excessive disapproval and unjustified dissatisfaction. Being persnickety is regularly linked to thorough attention to detail but can also be seen as a manifestation of perfectionism.
persnickety in Traditional Chinese Cambridge Dictionary