onerous

没有强有力的证据，这一主张难以辩护。

The claim is ___onerous to defend without strong evidence.

创办小企业所需的繁重文书工作让许多创业者望而却步。

The ___onerous paperwork required to start a small business discouraged many entrepreneurs.

沉重的按揭负担让这对年轻夫妇的可支配收入所剩无几。

The ___onerous mortgage payments left the young couple with little disposable income.