streamline - To design or shape something to reduce resistance to motion for speed or smooth flow; or to improve the efficiency of a process by simplifying or eliminating unnecessary steps.
We need to streamline the hiring process so it doesn’t take so long to bring in new employees.
senile - Used to describe behavior, mental states, or conditions associated with aging, especially when a person becomes forgetful or confused.
The elderly man showed symptoms of becoming senile, like forgetting where he put his keys, but with support, he managed to live independently for a while.