pernickety

 
Pronunciation: /pəˈnɪkɪti/

adjective

British informal
  • placing too much emphasis on trivial or minor details; fussy: she’s very pernickety about her food
  • requiring a particularly precise or careful approach: the system does not encourage additional enquiries on detailed and pernickety points

Origin:

early 19th century (originally Scots): of unknown origin