The mental and physical deterioration can occur swiftly or over a period of years.

However, by all indications, my own mental deterioration will be very rapid.

How old is she, do you think she may be having some mental deterioration?

He said that the two of them could have provided valuable insights into his brother's history and mental deterioration.

The effect on the victim is always the same: mental deterioration and death.

He is also beginning to show signs of mental deterioration.

You remember I said his mental deterioration had intrigued me for a while?

It was shot in the spring of 1967, around the time that his mental deterioration began.

Then I told him about the ammo and he must have been convinced as to my mental deterioration.

Alzheimer's is a major cause of mental deterioration in the elderly.