persnickety

1. 1. Overparticular about trivial details; fastidious.
   2. Snobbish; pretentious.
2. Requiring strict attention to detail; demanding: a persnickety job.

[Alteration of PERNICKETY.]

adjective

Very difficult to please: choosy, dainty, exacting, fastidious, finical, finicky, fussy, meticulous, nice, particular, squeamish. Informal picky. See accept/reject.

Definition: fussy, particular
Antonyms: open, unconcerned, unfussy

The adjective has 2 meanings:

Meaning #1: used colloquially of one who is overly conceited or arrogant
  Synonyms: bigheaded, snooty, snot-nosed, snotty, stuck-up, too big for one's breeches, uppish

Meaning #2: characterized by excessive precision and attention to trivial details
  Synonym: pernickety