monumental

a monumental discovery/achievement十分重要的发现/成就

It's more than a mistake; it's a case of monumental stupidity.这不仅是个错误，还是一个极其愚蠢的案例。

the monumental complexity of the issue问题的极端复杂性

Repairing the damage will be a monumental task/job.修复损毁将是个异常艰巨的任务/工作。

The class was about modern monumental architecture.这堂课讲的是现代纪念性建筑。