kendall: My ex often said "O felt badly..." that never sounded right to me, and, I used to ask her why she never said "I felt goodly.." Opinions please.
Opinions? We don't need no stinkin' opinions! We got the immortal truth--
"Felt badly" means your fingers weren't working properly, and you did a poor job of feeling some object.
"Felt bad" means you were ailing. In this sense, the verb "feel" is taken to be a variation of the verb "is." So one might say "I am good," "I feel good," "I am sick," "I feel sick," "I am bad," "I feel bad" (not that these have the same meaning, but rather the same type of constuction)--but one does not say "I am badly" nor "I feel badly" in this sense.