mistaken
1 adj If you are mistakenabout something, you are wrong about it.
v-link ADJ, oft ADJ about n
(=wrong)
I see I was mistaken about you..., You couldn't be more mistaken, Alex. You've utterly misread the situation. You use expressions such as if I'm not mistaken and unless I'm very much mistaken as a polite way of emphasizing the statement you are making, especially when you are confident that it is correct.
♦
if I'm not mistaken phrase PHR with cl (emphasis)
I think he wanted to marry her, if I am not mistaken..., Unless I'm mistaken, he didn't specify what time.
2 adj A mistaken belief or opinion is incorrect.
ADJ n
...a limited understanding of addiction and mistaken beliefs about how it can be overcome.
♦
mistakenly adv ADV with v
He says they mistakenly believed the standard licenses they held were sufficient.
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"