Comparative form of bonny; more attractive, beautiful, or pleasant, especially in Scottish and Northern English usage.
From 'bonny' (possibly from Scottish Gaelic 'bonne' or Old French 'bon' meaning good), with the comparative suffix '-er' added in standard English fashion.
In Scottish English, calling someone 'bonnier' is a beautiful compliment—it means not just prettier but also more vibrant and lively, which is why it's used for health and vitality too!
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