/ˈsɛnaɪl/ ə-SEEN-ul

Definitions

1. adjective

relating to or characteristic of old age, especially when accompanied by mental decline or deterioration.

“The elderly woman suffered from senile dementia and required full-time care.”

2. noun

a person who is suffering from senility.

“The doctor said that his grandfather was becoming increasingly senile and needed to be looked after.”

3. verb

to make (someone) lose their mental faculties or powers.

“The years of neglect and abuse eventually senile the young girl, making her unable to care for herself.”