Li Sheng croaked an unheeded warning.

For the world never learns - just as we did, They gallantly go to their fate, Unheeded all warnings, unheeded The maxims of elders sedate.

Peter Sellers famously said that of himself, and his words serve as a useful, unheeded warning.

How often in life does one go through the first tremors of a catastrophe and never realize that they were but the unheeded warning?

The unheeded warning, Mr. Dingell said in a closed hearing that evaluated secret intelligence data, was a major Governmental failure in which "an opportunity for timely action was missed."

The agents instead likened it to the Charge of the Light Brigade, laden with missteps, miscalculations and unheeded warnings that could have averted bloodshed.

Other unheeded warnings before 9/11?

Instead, they say, it was laden with missteps and unheeded warnings.

We gave unheeded warning to Congress of the impending bank and savings-and-loan crisis in the early 1980's, then investigated and helped prosecute thousands of offenders, recovering hundreds of millions of dollars.

Deep inside, Snake whispered an unheeded warning.