In a way that damages someone's reputation through false statements; in a defamatory manner.
From 'defaming' plus the adverbial suffix '-ly', which turns adjectives and verbs into adverbs describing how something is done. Maintains the Latin root structure through all transformations.
The adverb 'defamingly' appears mostly in legal contexts—lawyers might write 'the defendant spoke defamingly of the plaintiff'—it's the formal way to describe reputation-damaging speech in courtroom language.
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