I came across this infographic which contains the following claim:
Some grammarians consider "ly" ending adverbs as bad style in formal writing.
Are there any serious style advice sources that actually make this dubious claim? What's the theory for how avoiding such adverbs improves writing?
I've done some further research and found that this notion is widespread, but there is little citation or authority. Where did this idea come from?
For what it's worth, here's a blog entry that claims "Aspiring science-fiction authors receive one piece of advice above all others: Forsake the adverb, the killer of prose. It's terribly, awfully, horrendously important." — Seriously, What’s So Bad About Adverbs?
To make the point about as clear as I can - using "ly" ending adverbs is BAD WRITING for fiction writers. — Those "ly" Ending Adverbs