All 3 Uses

senile
in
A Thousand Acres
(Auto-generated)

So I served up his food silently and told myself that he wasn't senile—it would be insulting to treat him like a child and make him account for his time and his money.†
p. 115.6

senile = mental weakness caused by old age; or describing a medical condition as caused by old age
This has got to be senility talking, or Alzheimer's or something.†
p. 181.7

senility = mental weakness caused by old age
I wanted him to feel remorse and know what he did and what he is, but when you see him around town and they talk about him, he's just senile.†
p. 303.3 *

senile = mental weakness caused by old age; or describing a medical condition as caused by old age

Definitions:

(1) (senile)
weakness from old age (especially mental weakness); or describing a medical condition as caused by old age
(2) (meaning too rare to warrant focus)