Mistaken
Definition 1 of 2
Pro Tip 1/3
Common Confusion
Easily confused with 'misunderstood', which means not grasped clearly. You misunderstood my point, but also, you were mistaken about the facts.
Pro Tip 2/3
Polite Correction
Use 'You might be mistaken' to gently correct someone. You might be mistaken about the meeting time; it's at nine.
Pro Tip 3/3
Self-Admission
'I was mistaken' shows you acknowledge your own error. I was mistaken about her intentions, and I apologize for that.