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English definition of “senile”

senile

adjective     /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.Describing people who are oldThe elderlyMental and psychiatric disorders senility     /sɪˈnɪl.ɪ.ti/ US  /-ə.t̬i/ noun [U] The elderlyOld or old-fashionedDescribing people who are oldMental and psychiatric disorders
(Definition of senile adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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