If you are mistaken about something, you are wrong about it.
例句
I see I was mistaken about you...我明白我以前錯怪你了。You couldn't be more mistaken, Alex. You've utterly misread the situation.亞歷克斯，你真是大錯特錯，你對局勢的判斷根本不對。
ADJ
(信仰、意見)錯誤的，不正確的
A mistaken belief or opinion is incorrect.
例句
I had a mistaken view of what was happening.我對當時發生的事情曾有一種錯誤的認識。...a limited understanding of addiction and mistaken beliefs about how it can be overcome.對上癮的有限認識和關于如何將其戒除的錯誤觀念
英漢詞典釋義
adj.
(人)弄錯的;理解錯誤的
You are mistaken if you think he’s clever.如果你認為他聰明, 那你就錯了。
英英詞典釋義
Adjective
1. wrong in e.g. opinion or judgment;
"well-meaning but misguided teachers""a mistaken belief""mistaken identity"
2. arising from error;
"a false assumption""a mistaken view of the situation"