I shut out the memory which was too painful to dwell on.

我不让自己去回忆那段会引起我太多痛苦的往事。

《柯林斯英汉双解大词典》

My ankle is still too painful to walk on.

我的脚腕子还是疼得不能走路。

《牛津词典》

That was too painful.

因为它太痛苦了。

youdao

So some people say reading it is too painful and insulting for black children.

VOA: special.2010.03.21

And sometimes the advice that follows can be painful,too.

VOA: special.2010.08.11

Worrying that to stop injecting cortisone will be too painful is a false palliative.

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Perhaps when Bernie traded for clients he felt it was too painful to report disappointing numbers.

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Many Icelanders have become frustrated with the outgoing Social Democrat government, saying that its austerity policies were too painful.

BBC: Iceland vote: Centre-right opposition wins election