Here are the results of a survey of the Usage Panel of the American Heritage Dictionary. "badly" meaning "ill" (I have a terrible sore throat. ) In writing: acceptable: 25% unacceptable: 75% In speech: acceptable: 31% unacceptable: 69% "badly" meaning "regretful" (I had to break my promise.
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USAGE NOTE Bad is often used as an adverb in sentence