onerous
adj. <正式>费力的,艰巨的;<法律>义务沉重的
例句
Nothing onerous, I promise!
我保证,不会太麻烦。
Too few, and the management of the classes becomes onerous.
如果太少,类的管理会很费力。
These problems are onerous, but most are probably tractable.
这些问题是繁杂的,但大多数是可以纠正的。