jejune
adjective formal disapproving uk/dʒəˈdʒuːn/ us/dʒəˈdʒuːn/
简单的;幼稚的，不成熟的
very simple or childish
He made jejune generalizations about how all students were lazy and never did any work. 他以偏概全地认为所有的学生都很懒，什么都不干。
沉闷乏味的
boring and not interesting
a jejune lecture by one of our professors 我们的教授之一讲的一堂乏味的课