There is no such word as ill-balanced. I presume you mean unbalanced which means some who is erratic, unsound, not stable, physically or mentally
The best word to use to describe someone who is mentally healthy and sound is stable. This means that they are sane and sensible and not likely to fail.
You need to be emotionally, mentally and socially healthy. It is because it keeps you stable in society.
Depends what you consider mentally stable To add to this answer: If you would like to know about him, there is a vast amount of reading you can do and educate yourself @ http://www.burzum.org In no way is Burzum.org affiliated with Burzum.com
The abstract noun form of the adjective 'sane' is saneness.Related abstract nouns are sanity and insanity.
Stability is not a change but a characteristic; a material can be chemically stable, physically stable, etc. The whether can be stable or not. A man can be mentally stable or not, etc.
Mentally capable means if you are up to it mentally and if your mind can comprehend it.
Because they are little girls, or they aren't mentally stable.
To be mentally tough means to be tough to the mind.
Dumb means that you can't speak. Mentally retarded means that your IQ is below 70.
There isn't direct evidence but because of his family background and the way he depends on Dick to do the "dirty work" could mean that he is emotionally unstable. Also, his artistic gifts and his obsessions with people could also be evidence that he is not mentally stable.
physically means well its like a verb its something you do with your body. mentally means when you think it, like emotions.