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English definition of “senile”

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senile

adjective uk   /ˈsiː.naɪl/ us    /ˈsen.aɪl/
showing poor mental ability because of old age, especially being unable to think clearly and make decisions: He spent many years caring for his senile mother. I'm always losing my keys these days. I think I must be going senile.
senility
noun [U] uk   /sɪˈnɪl.ɪ.ti/ us    /-ə.t̬i/
(Definition of senile from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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