This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. in an erroneous manner

ad. incorrectly

In an erroneous manner; by mistake; not rightly; falsely.

ad. in a mistaken manner

"Biden's campaign is only "over" in the sense that a car is "dead" - the term erroneously supposes some preexisting animate state."

harmoniously    unceremoniously