In a way that is harmful, unfavorable, or opposed to your interests.
From the adjective 'adverse' (Latin 'adversus,' turned against) with the '-ly' adverbial suffix. This compound structure emerged in English around the 15th century as a standard way to convert the adjective into an adverb form.
The word 'adversely' is crucial in legal and medical writing—courts and doctors use it to describe negative effects with precise language, making it a power word in high-stakes contexts where accuracy matters.
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