Just yesterday I (native English speaker) was reading a novel and the word "lonelily" was used, I thought it was an error but now see it is considered acceptabl

Just yesterday I (native English speaker) was reading a novel and the word "lonelily" was used, I thought it was an error but now see it is considered acceptable as an adverb at least according to one online dictionary.[0] [0]https://www.collinsdictionary.com/ko/dictionary/english/lonelily https://www.collinsdictionary.com/ko/dictionary/english/lone...