senile Definition in the Cambridge English Dictionary
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Definition of “senile” - English Dictionary

Definition of "senile" - American English Dictionary

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senileadjective

 us   /ˈsi·nɑɪl, ˈsen·ɑɪl/
mentallyconfused as a ​result of ​oldage: Her ​children couldn’t ​cope with her because she’s ​somewhat senile.
senility
noun [U]  us   /səˈnɪl·ɪ·t̬i/
Miller ​suffers from senility.
(Definition of senile from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "senile" - British English Dictionary

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senileadjective

uk   /ˈsiː.naɪl/  us   /ˈsen.aɪl/
showingpoormentalability because of ​oldage, ​especially being ​unable to ​thinkclearly and make ​decisions: He ​spent many ​yearscaring 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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