Is there a word to describe the state of believing you know something that is false?


When you do not know a fact you are ignorant. My question is what would you call the state of believing you know something that is false.


For instance suppose I see a black box and having opened it earlier, I know there is a rabbit in it. Some time later unbeknownst to me someone removes the rabbit. I still 'know' there is a rabbit in the box.


What do you call this state?



Answer



One word is mistaken.



adjective
  wrong in one’s opinion or judgement:
    she wondered whether she’d been mistaken about his intentions
      based on or resulting from a misunderstanding or faulty judgement:
        don’t buy a hard bed in the mistaken belief that it is good for you
        an unfortunate case of mistaken identity


[ODO]



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