In a rough, harsh, or severe manner; with roughness or harshness.
From Latin 'asper' (rough) + adjective suffix '-ous' + English adverbial suffix '-ly'. This adverb describes the manner of performing an action with harshness or roughness.
When medieval writers wanted to describe stern rejection, they often wrote that something was 'asperously refused'—the word itself sounds rough when spoken aloud.
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