senile

1. ADJ If old people become senile, they become confused, can no longer remember things, and are unable to take care of themselves. 衰老的; 年老糊涂的

2. senilityN-UNCOUNT 衰老; 年老糊涂

The old man was forced to resign after showing unmistakable signs of senility. 那个老头明显有了年老糊涂的迹象后就被迫辞职了。