n.被抛弃者，流浪的人，被驱逐的人，流氓，无赖
adj.被遗弃的，被逐出（家庭，国家）的，无家可归的，被排斥的
He had always been an outcast, unwanted and alone.
他一直都被视为异类，无人理睬，形单影只。
He was treated as a social outcast.
他为社会所摈弃.
He was treated like an outcast by the other children.
他受到其他小朋友的排斥.
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