sedulous
adjective formal uk/ˈsedʒ.ə.ləs/ us/ˈsedʒ.ə.ləs/
小心的，勤奋的，刻苦的
careful and using a lot of effort
It was agreed that the few students sedulous enough to read the book deserved top marks for diligence. 大家同意，那些勤奋并读了这本书的学生应该因为刻苦而得最高分。