To be disdainful means to dislike something or someone because you think they are unimportant or not worth your attention.
例句
He is highly disdainful of anything to do with the literary establishment...他对任何与文学界权威沾边的事都嗤之以鼻。Edgar cast a disdainful look at his twin.埃德加朝他的双胞胎兄弟投去鄙夷的目光。