The quality of being bonnie, which means attractive, healthy-looking, or pleasant in appearance.
From Scottish 'bonnie' (beautiful, comely) plus the English suffix '-ness' (state or quality). 'Bonnie' may derive from Old French 'bon' (good) or Latin 'bonus.'
The word 'bonnie' is so tied to Scottish identity that 'Bonnie Prince Charlie' and 'Bonnie and Clyde' both used it to suggest charm and appeal—it's pure marketing before marketing existed.
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