In a manner that is blue in color, or in a sad, melancholy way; displaying blue characteristics.
From 'blue' + '-ly' (Old English suffix forming adverbs), creating an adverbial form meaning 'in a blue manner' or 'with blue qualities'.
Adverbs like 'bluely' are rarely used in modern English, but they reveal how medieval and early modern writers thought of colors as moral and emotional states, not just visual properties.
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