"Stringent" means strict or demanding. It is used to describe rules, regulations, or standards that are very precise and must be followed closely. Full definition
You will have to meet more stringent requirements as the bank determines if it wants to tailor a loan for you circumstances. (orlandosentinel.com)
One of the biggest problems has been a set of changes made to immigration law in 2016, introducing considerably more stringent requirements for identifying people who need help. (politics.co.uk)
This is a less stringent standard than material participation. (hrblock.com)