stringent

(of a rule, law, etc.) very strict and that must be obeyed เข้มงวด

The F1 route would have to undergo stringent safety checks and there is no guarantee it will be approved.

Mr Sermsak said stringent measures would be imposed for the new round of exams for teaching assistants in April.

Suppliers of vehicle navigation systems will have to meet more stringent standards to boost the accuracy of their devices, the transport minister says.