In a manner that shows you feel wronged, hurt, or offended.
From 'aggrieved' (past participle of 'aggrieve,' meaning to wrong or injure) plus the adverbial suffix '-ly.' The base verb comes from Old French 'agrever,' from Latin roots meaning 'to weigh down.'
You rarely see this adverb in modern writing, but when authors do use it, it signals a very specific emotion—not just sadness, but the particular sting of feeling *unjustly* treated, which is why it's perfect for drama and literature.
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