Superlative form of bonny; most attractive, beautiful, or pleasant; having the highest degree of bonny qualities.
From 'bonny' with the superlative suffix '-est', forming the highest degree of the adjective in English.
The 'bonniest' was a term Scots would use for the most beautiful person at the dance or the healthiest baby—it combines physical beauty with a kind of robust vitality that's distinctly Scottish!
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