RedRoom member Dennis Shay inspired this one in a blog comment. The answer's interesting enough to stand on its own as a blog entry:
Can you say "You did it good" to mean "You did it well"? Yup.
Webster's New World lists good as an adverb. A synonym for well.
American Heritage does too, but clearly labels it "informal."
Merriam-Webster allows it, too, but includes the note:
Adverbial good has been under attack from the schoolroom since the 19th century. Insistence on well rather than good has resulted in a split in connotation: well is standard, neutral, and colorless, while good is emotionally charged and emphatic. This makes good the adverb of choice in sports <“I'm seeing the ball real good” is what you hear — Roger Angell>. In such contexts as <listen up. And listen good— Alex Karras> <lets fly with his tomatoes before they can flee. He gets Clarence good— Charles Dickinson> good cannot be adequately replaced by well. Adverbial good is primarily a spoken form; in writing it occurs in reported and fictional speech and in generally familiar or informal contexts.
I'm not sure I buy that business about the split connotation. But I like that they included a note of caution. Personally, I'll take this word of caution to heart. People tend to rough me up when I use adjective-sounding words as adverbs. But it's good to know I have a solid defense if I slip up.
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