onerous

adj.繁重的,费力的,负有法律责任的

繁重的；负担沉重的；费力的

形容词

1、The task of cleaning up the entire house after the party was onerous.
在派对之后清理整个房子的任务非常繁重。
2、The student complained about the onerous workload assigned by the professor.
学生抱怨教授布置的负担沉重的课业任务。