If you describe someone as unbalanced, you mean that they appear disturbed and upset or they seem to be slightly mad.
例句
I knew how unbalanced Paula had been since my uncle Peter died...我知道葆拉自从我叔叔彼得去世后情绪一直很不稳定。He was shown to be mentally unbalanced.他被证明精神有问题。
ADJ-GRADED
不公正的；偏颇的；片面的
If you describe something such as a report or argument as unbalanced, you think that it is unfair or inaccurate because it emphasizes some things and ignores others.
例句
UN officials argued that the report was unbalanced.联合国官员指出那份报告有失公允。...unbalanced and unfair reporting.片面、不公正的报道
英汉词典释义
adj.
不平衡的;不稳定的;不均衡的
精神错乱的
The murderer was completely unbalanced.那个杀人犯完全是丧心病狂。