Somewhat bonny; fairly attractive, good-looking, or pleasant, though not exceptionally so.
From 'bonny' (Scottish and Northern English dialect for attractive or good) plus the suffix '-ish' (meaning somewhat or rather), creating a diminished version of the original quality.
The suffix '-ish' is wonderfully English—it lets you hedge your compliments, saying something is 'bonnyish' instead of fully committing to calling it beautiful, which is peak British understatement.
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