Bad-Badly | Commonly Confused Words

Bad

/bad/

Not good or of poor quality

The weather is bad today; it's raining.The accuracy of a forecast gets worse over time.But I am thankful to say the worst has not happened.

/ˈbædli/

To do something in a poor or incorrect way

I slept badly that night.'Ralph behaved very badly to you.'Passepartout didn't want Mr. Fogg to think badly of them.

Bad is an adjective describing a noun; it tells us the state or quality of something.
Badly is an adverb that modifies a verb, describing how an action is performed.
Think of bad as a descriptive state, such as a bad weather, which describes weather itself.
On the other hand, badly often follows verbs, showing how poorly something was done, like She sang badly.
Remember that bad describes something or someone, while badly describes how something is done.