形容詞 operose:

1. characterized by toilsome effort to the point of exhaustion; especially physical effort
   同義詞：arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome

op.er.ose

adj.（形容詞）
Involving great labor; laborious.
費力的，艱苦的
Industrious; diligent.
勤勉的，刻苦的

來源：
Latin operôsus
拉丁語 operôsus
from opus oper- [work] * see op-
源自 opus oper- [工作] *參見 op-

【引伸】
op.erose.ly
adv.（副詞）
op.erose.ness
n.（名詞）