There will be those reading this book who are physically or mentally incapable of doing a great deal of work in this world.

King Otto had been judged to be mentally incapable of ruling.

This woman was in a home for the mentally incapable.

To see that her financial affairs as a whole are being managed properly for her, according to the law, if she is mentally incapable.

You have not been adjudged as mentally incapable by a court or by competent authority.

The minor must consent to abortion unless mentally incapable or in medical emergency.

That is particularly in the case of older, very young, mentally incapable or other vulnerable persons:

In the psychologist's view, the woman was compliant, easily victimized and mentally incapable of refusing.

There he died, reliant on support by staff and mentally incapable, on 3 July 1889, aged 52.