|Which is correct?
The manager felt ______ about denying your vacation request.
In this sentence, bad is an adjective. This construction is used with linking verbs such as is, feels or seems. If an action verb was used, such as behaved, badly would be the correct answer.
Think of it this way: You wouldn’t say “The garbage smelled badly” but “The garbage smelled bad.” If something smells badly, that means that its sense of smell is impaired.