Excessively particular or fussy; a person who is overly concerned with small details or refinements.
Variant or related form of finical or finicky, with possible diminutive -kin suffix. This appears to be an older or dialectal variant of the finical/finicky word family.
The '-kin' suffix (seen in words like 'lambkin' and 'pumpkin') often creates diminutive or affectionate forms, but 'finikin' suggests an older layer of English where this pattern was more productive for creating personality-type nouns!
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