Very fussy, particular, or hard to please; likely to find fault with many things or require very specific conditions to be satisfied.
Possibly derived from Scottish 'finnick' or from 'finical' (an older English word meaning fussy). The exact origin is debated, but the word became mainstream in American English during the 19th century.
Finnicky is one of those words that's *hard to spell* on purpose—those double n's and k's make it look complicated, which almost makes it seem *more* fussy, like the word itself is being difficult!
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