Giving a lot of attention to details that are minor or not important.
1) As she got older, she became more and more persnickety.
2) He lacked the patience to deal with persnickety tasks, such as hanging the wallpaper.
Alteration of pernickety, which is of unknown origin.
choosy, dainty, delicate, demanding, finnical, fussy, fastidious
undemanding, unfastidious, unfussy.