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...男人們似乎仍然錯誤地認為女人喜歡體毛濃重、肌肉強健的男人。We were by now under no misapprehension about the extent of the problem.到目前為止，我們對問題的嚴重程度的理解并無偏差。