laborious

形容词 laborious:

1. characterized by toilsome effort to the point of exhaustion; especially physical effort
   同义词：arduous, backbreaking, grueling, gruelling, hard, heavy, operose, punishing, toilsome

1. Spent many laborious hours on the project.
   这项工程耗费了长期的艰辛劳动
2. Laborious study or meditation.
   刻苦的学习勤奋的学习或思考
3. Her work is a laborious task.
   她的工作很艰苦。
4. He has a laborious style of writing.
   他的文笔不流畅。

la.bo.ri.ous

adj.（形容词）
Marked by or requiring long, hard work:
吃力的：需要长时间的艰辛劳动的或以此为特点的：
例句：
spent many laborious hours on the project.
这项工程耗费了长期的艰辛劳动

Hard-working; industrious.
艰辛工作的；勤劳的

来源：
Middle English
中古英语
from Old French laborieux
源自 古法语 laborieux
from Latin labôriôsus
源自 拉丁语 labôriôsus
from labor [labor]
源自 labor [劳动]

【引伸】
labo.riously
adv.（副词）
labo.riousness
n.（名词）