Etymology
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pernickety (adj.)

1808 (pernicktie, in Jamieson), of persons, "precise; fastidious; fussily particular, especially about trifles," an extended form of Scottish pernicky, which is of uncertain origin, perhaps somehow from particular. "Association with the knick group of words ... may have been vaguely present" [OED].

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Definitions of pernickety

pernickety (adj.)
characterized by excessive precision and attention to trivial details;
Synonyms: persnickety
From wordnet.princeton.edu