ameliorate (v.)
1) to make better or more tolerable

Use: "medicine to ameliorate the pain"

ameliorate

cohort (n.)
1) a group of people banded together or treated as a group, especially when working near each other or working towards a similar goal 
2) a group of people having approximately the same age

Use: The 2019 cohort at Harvard Law School had 250 students.

cohort

rigorous (adj.)  
1) extremely thorough, exhaustive, or accurate
2) describing a rule or system strictly applied or adhered to
3) describing a person following a strict and inflexible belief, opinion, or way of doing something

Use: A rigorous teacher never allows students to submit assignments late.
Use: The athlete’s rigorous training schedule included running 100 kilometres every week.

rigorous

astute (adj.) 

Having or showing an ability to accurately assess situations or people and turn this to one's advantage

Use: The astute businessman used recent falls in the price of oil to operate his manufacturing plant at a lower cost.

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