I have suffered a martyrdom from their incompetency and caprice.

我因他们的无能和反复无道。

He listened to her moans about lost customers and bad debts, the swindling ways of Mr. Johnson and the incompetency of Hugh.

他总是全神贯地听她发牢骚，说她怎样顾客，怎样放呆帐，约翰逊先生如何欺骗她，以及休多么无能，等等。