His prejudgment about the new colleague caused many misunderstandings.

prejudgment 是由前缀 pre-（表示“在...之前”）和名词 judgment（判断）组成的复合名词，字面意思是“预先判断”，即“在了解事实之前就形成的判断”，也就是“偏见”或“先入为主的看法”。