rigorous

done carefully and with a lot of attention to detail อย่างเข้มงวด, อย่างเคร่งครัด

While urban monks focus on the studies of Buddhist texts, forest monks devote themselves to rigorous meditation and a life of simplicity close to nature.

Already 56 of their classmates have dropped out of the training programme; those who remain are nearing the end of a series of rigorous sessions that take more than a year to complete.

Klong Toey port would also carry out rigorous inspections of rice imports.