Alphabetic S
scintillating - Describing someone or something that is exceptionally witty and entertaining, and is intellectually or emotinally stimulating.
Her scintillating conversation captivated those she talked to at the dinner party, leaving them laughing and enjoying themseles.
senile - Used to describe behavior, mental states, or conditions associated with aging, especially when a person becomes forgetful or confused.
The elderly man showed symptoms of becoming senile, like forgetting where he put his keys, but with support, he managed to live independently for a while.