Definition of “senile” - English Dictionary

(Definition of “senile” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“senile” in American English

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us /ˈsi·nɑɪl, ˈsen·ɑɪl/

mentally confused as a result of old age:

Her children couldn’t cope with her because she’s somewhat senile.
noun [ U ] us /səˈnɪl·ɪ·t̬i/

Miller suffers from senility.

(Definition of “senile” from the Cambridge Academic Content Dictionary © Cambridge University Press)