She found his physical state disgusting, and he was suffering from mental degeneration and using a litter for travel.

They discuss their father's mental degeneration, which they have witnessed by his constant vacillations and talking to himself.

This might have been the basis of allegations that his erratic behavior reflected the mental degeneration of untreated syphilis.

But this mental degeneration may be brought to one test, which I truly believe to be a real test.

Just take my word that though we haven't performed any surgery, we know that this alien signal caused a mental degeneration involving physical damage to the brain.

In contrast to other members of his race who were afflicted with a mental and psychic degeneration, Senekho seemed to have considerably outstanding qualities.

Elaborating, he says that "epilepsy leads to physical and mental degeneration, and there are no signs of that in Muhammad."

"But wasn't that earlier kind of rejuvenation associated with mental degeneration?"

One of the effects is mental degeneration, usually characterized by megalomania.

(In the second edition he coined the term démence-precoce to refer to mental degeneration).