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What is the origin of persnickety?

Persnickety “overparticular, fussy” is a variant of pernickety, a Scottish English word of uncertain origin. Per- is a common prefix in expressive words in the Scots language, such as perjink “exact, neat, trim,” perskeet “fastidious,” and perjinkity “exact detail,” all of which are similar in meaning to persnickety. One hypothesis is that persnickety and pernickety are compounds of this prefix per- and the noun nick “small notch, hollow place” or a diminutive of nick such as nickett. Alternatively, persnickety could be related to the adjective snickety, also meaning “fussy,” or to the noun snicket “passageway between walls or fences,” but the connection is unclear. The final theory is that persnickety and pernickety are heavily corrupted variants or fusions of particular “exceptionally selective” and finicky “excessively fastidious.” Persnickety was first recorded in English in the late 1880s.