In the sense learners meet most, senile means mentally confused or behaving in a strange way because of old age: forgetting names, mixing up the day, wandering, saying things that do not fit.

In the sense learners meet most在學習者最常遇到的意思裡 senile meanssenile指的是 because of old age因為年紀大 mentally confused or behaving in a strange way而顯得神智不清或舉止怪異 forgetting names像是忘記名字 mixing up the day搞混今天是星期幾 wandering到處遊走 saying things that do not fit或說出不合時宜的話

It is an old medical-sounding adjective, and though actually doctors today more often say dementia, because senile has picked up a sting. People use it as a blunt label, and it can sound like a joke at someone’s expense.

It is它是一個 an old medical-sounding adjective聽起來很醫學的舊形容詞 and though actually不過其實 doctors today今天的醫生 more often say dementia比較常說dementia（失智） because senile has picked up a sting因為senile這個字已經帶了刺 People use it as a blunt label大家把它當成一個很直白的標籤來用 and it can sound like聽起來可能像 a joke at someone's expense在拿某人開玩笑

The older, broader meaning was simply ‘of old age’ (you still see senile in a few technical terms), but in ordinary English the word now points at the mind, not just grey hair.

The older, broader meaning較早、較廣的意思 was simply 'of old age'單純就是「年老的」 (you still see senile in a few technical terms你還會在少數專業術語裡看到senile這個用法) but in ordinary English但在一般英文裡 the word now points at the mind這個字現在指的是頭腦 not just grey hair而不只是白頭髮

It is harsh in the mouth of a young person talking about a parent. If you need a kind, clear word for the illness, dementia is safer in English, and 失智 is safer in Taiwan.

It is harsh它聽起來很刺耳 in the mouth of a young person如果是從年輕人口中說出來 talking about a parent在談論自己的父母時 If you need如果你需要 a kind, clear word一個溫和清楚的說法 for the illness來說這個病 dementia is safer in English英文裡dementia比較安全 and 失智 is safer in Taiwan而在台灣則是「失智」比較安全