senile [ˈsiˌnaɪl, ˈsɛnˌaɪl]

例句:

• What exactly goes wrong with those suffering from senile dementia?
  那些患老年痴呆症的人到底出了什么问题？
  
• She is suffering from senile dementia.
  她患有老年痴呆症。
  
• Don't mind the old lady. She's getting senile.
  不要在意这个老太太，她有点儿老糊涂了。
  
• Lindsey's young enough to build up some seniority before he gets senile.
  来自NEWYORKER
• Her father had been senile for some years, and an increasing burden on his wife.
  来自P. Dally
• Yes, as a matter of fact I am making fun of a senile old man and the pathetic goobers that fell for his delusion.
  来自SA