Most fussy, particular, or difficult to satisfy; the superlative form indicating the highest degree of pickiness or fastidiousness.
Superlative form of finnicky, using the standard English superlative suffix '-est.' This represents the complete grammatical integration of a once-dialectal word into modern standard English.
Superlatives like 'finnickiest' show how language constantly recycles and adapts—a Scottish dialect word that maybe 200 years ago only a few thousand people knew is now understood by hundreds of millions worldwide!
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