Her prideful behavior made classmates reluctant to work with her.

prideful 是由名词 pride（骄傲）加上后缀 -ful 构成的形容词，-ful 表示"充满...的"，所以 prideful 意思是"骄傲的、自满的"。 prideful behavior 指表现出骄傲自满的行为或态度。