Pernicitive 

To be very picky about something.

I was very pernicitive about choosing a new T-shirt.

Pernicitive by HEY x April 13, 2022

pernickative 

fussy, focusing too much on trivial or minor details.

Mark was too bloody pernickative about every word, impacting his friends adversively.

pernickative by velvetcad November 1, 2011