柯林斯词典senile dementia 1. N-UNCOUNT Senile dementia is a mental illness that affects some old people and that causes them to become confused and to forget things. 老年性痴呆 She is suffering from senile dementia. 她受老年痴呆症折磨。 返回 senile dementia剑桥词典a medical condition that causes the memory and other mental abilities of old people to gradually become worse , leading them to behave in a confused manner 老年性痴呆 返回 senile dementia