adv
mistakenly
mih-STAY-kuhn-lee
adv
1
In a way that is wrong or due to an error; by accident.
"He mistakenly sent the email to the whole office."
"She mistakenly assumed the store was closed."
How to Use Mistakenly
Learner’s notesIn plain EnglishBy error, without meaning to.
Common pairings
mistakenly believed
mistakenly assumed
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He _____ sent the email to the whole office.
Etymology
From mistaken plus the adverb-forming suffix -ly.