erroneously
adv.in a way that is wrong or based on a mistake.
adv.in a mistaken or incorrect manner; based on an error in fact or logic.
“The computer erroneously flagged the file as a virus.”
“The bank erroneously credited her account with an extra thousand dollars due to a software glitch.”
“Historians once erroneously believed the ruins dated back to the Bronze Age, but modern carbon dating has since corrected that timeline to the medieval period.”
Typically placed before the verb it modifies or at the end of the clause.
Learners often use the adverb 'erroneously' when the adjective 'erroneous' is required after a linking verb like 'be'.
“An earlier version erroneously included a release date for the game, but none has yet been announced.”
“Kennedy Jr., often claim erroneously that children’s immune systems are overloaded because the number of vaccines they receive has increased.”
From erroneous + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.