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Adjective: pernickety  pu(r)'ni-ki-tee
Usage: Brit, informal (N. Amer: persnickety)
  1. Characterized by excessive precision and attention to trivial details
    "a pernickety job";
    - persnickety [N. Amer, informal]
     
  2. Overly conceited or arrogant; showing or characterized by a superior, disdainful, or haughty attitude
    "His pernickety behaviour after winning the award annoyed his colleagues";
    - bigheaded, snooty [informal], snot-nosed [informal], snotty [informal], stuck-up [informal], too big for one's breeches [informal], uppish [informal], snobbish

See also: fastidious, proud, toffee-nosed [Brit, informal]