His clumsiness embarrassed him.

他的笨拙令他尴尬。

I was ashamed and appalled at my clumsiness and insensitivity toward her.

我为自己对她如此笨拙和冷漠而感到羞耻和震惊。

I'm very sorry for mistakes (clumsiness).

我为我的错误(笨拙)道歉。

I seem to be suffering from clumsiness lately.

最近我似乎显得很笨拙。

She regrets their own ignorance and clumsiness.

她悔恨自己的无知与笨拙。