There's a similar touch of ineptitude (senility, perhaps) in the Memorabilia, ad fin.

Clinton's position was difficult but he was saved by Lee's ineptitude.

To them, in their then ineptitude, what I shall say now would have been unintelligible.

Besides, it roused his gorge to feel that here was an example of British ineptitude.

Gordon was simply sacrificed to ineptitude in high quarters at home.

There may be error in the result, but it comes from lack of data not from ineptitude in handling them.

People are often unkind, not from malignity, but from ineptitude.

Instinct does not hesitate in the face of this ineptitude: it seals up emptiness.

I repeated, struck by the ineptitude of the remark, and thinking I had heard imperfectly.

But, fortunately, the realization of my ineptitude came uppermost.