His misattribution of nervousness made him think he was excited about the speech.

misattribution 是由前缀 mis-（表示“错误”）和名词 attribution（归属、归因）组成的复合名词。mis- 表示“错误的”，attribution 来自动词 attribute（归因于），所以 misattribution 的字面意思是“错误的归因”，即“误判”或“错误地归因于”。