Their failure to act is indicative of their lack of interest.

他们未采取行动，这表示他们没有兴趣。

《牛津词典》

Only by this means is it possible to explain his failure to act decisively.

只有这种方法，才有可能解释他没有采取决定性行动的原因。

youdao

Did you ever stop to think that even failure to act is a way of communicating?

你有没有停下来思考，有时没有动作反而是交流的一种方式？

youdao

General McClellan kept making excuses for his failure to act.

VOA: special.2009.09.17

Republicans also link potential costs with what they say is the failure so far of the American Recovery and Reinvestment Act the $787 billion stimulus plan approved by Congress to speed up economic recovery, an assertion the president and Democrats reject.

VOA: standard.2009.07.21

Yet, failure to act in a timely basis will lead to an even greater crisis.

FORBES: Higher Inflation Is On The Way

Hopefully, such failure to act would be equally disastrous to the political careers of everyone involved.

FORBES: Connect

The states contend that they are suffering significant damage because of the EPA's failure to act.

NPR: Supreme Court Hears Global Warming Arguments