The superlative form of feisty; the most energetic, spirited, or argumentative.
From 'feisty' plus the superlative suffix '-est.' This intensifies the original concept of liveliness and combative spirit found in the noun 'feist.'
The superlative '-est' ending is one of the oldest grammatical features in English, dating back to Old English, so when you say 'feistiest,' you're using a word-building technique that's over 1,500 years old!
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