not firm but likely to fall or change position suddenly

mentally ill

His relatives have said he became unbalanced after the death of his father. 亲戚们说他在父亲去世后就精神失常了。

not fair or equal; false

unbalanced reporting 观点偏颇的报道

He gave an unbalanced view of the situation. 他对该局势发表了有倾向性的观点。

not consisting of a combination of the correct types and amounts of food

an unbalanced diet 不均衡的饮食

an unbalanced meal 营养不均衡的膳食