Last night on “Celebrity Apprentice,” Donald Trump corrected Cyndi Lauper’s grammar. She said “I feel bad.”
He said it’s “I feel badly.”
If you are expressing an emotion, it’s correct to say “bad.”
Saying “I feel badly” means you can’t physically feel things very well – your sense of touch is off. Your fingers don’t work well.
Remember: you wouldn’t say you “feel madly” or “feel sadly,” right?
This applies to other verbs that describe senses, e.g. taste and smell. “Smell bad” means you stink; “smell badly” means your sense of smell is off.
Donald, you’re fired as a grammar coach.