Synonyms:
mistakenly, erroneously
Meaning: in a mistaken manner; "he mistakenly believed it"
Usage examples
He imagined, probably mistakenly, that this low-necked bodice had been made on his account, and felt that he had no right to look at it, and tried not to look at it; but he felt that he was to blame for the very fact of the low-necked bodice having been made.