Adverb
By mistake.
Source: Webster's dictionaryPeople mistakenly assume that their thinking is done by their head; it is actually done by the heart which first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
Honest people, mistakenly believing in the justice of their cause, are led to support injustice. Elihu Root
Many people mistakenly think a new technology cancels out an old one. Judith Martin
Human beings are works in progress that mistakenly think they're finished. Daniel Gilbert
We have doomed the wolf not for what it is, but for what we deliberately and mistakenly perceive it to be –the mythologized epitome of a savage ruthless killer – which is, in reality, no more than a reflected image of ourself. Farley Mowat
When we were growing up our parents somehow made it clear that being famous was good. And I mistakenly thought that if I was famous then everyone would love me. Ellen DeGeneres