A misapprehension is a wrong idea or impression that you have about something.
例句
Men still appear to be labouring under the misapprehension that women want hairy, muscular men...男人们似乎仍然错误地认为女人喜欢体毛浓重、肌肉强健的男人。We were by now under no misapprehension about the extent of the problem.到目前为止,我们对问题的严重程度的理解并无偏差。