senile

se|nile /s'iːnaɪl/
[ADJ]
If old people become senile, they become confused, can no longer remember things, and are unable to look after themselves.
senility [N-UNCOUNT]
The old man was showing unmistakable signs of senility.se|nile de|men|tia
[N-UNCOUNT]
Senile dementia is a mental illness that affects some old people and that causes them to become confused and to forget things.
She is suffering from senile dementia.

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