"deadly risks" is a perfectly correct and usable phrase in written English.
For example, you could use it in the sentence "The commander faced deadly risks as he led his troops into the enemy camp."
Both behaviors have advantages for survival, saving learning time and avoiding deadly risks.
As we are now seeing, this connectedness also entails deadly risks.
Despite the deadly risks, journalists with guns are seen as a taboo in the world of respectable reporting.
Given the deadly risks believed to accompany the condition, soldiers of all ranks monitored their own mental health as well as that of their comrades.
Sure he was a killer, but he murdered for professional reasons only, in a business whose rules and deadly risks were known to anyone who entered that life.
Also, the valley's chronic high-unemployment rate makes recruiting workers, ignorant of the deadly risks of producing the drug, as easy as selling lemonade on a hot day.
Home-preserved foods filled in dietary gaps, but if stored improperly botulism became a real — and deadly — risk.
While there were no serious injuries in the recent manhole blasts, Mr. Long said that there was a deadly risk in the carbon monoxide fumes produced by the fires.
The poor quality of materials used for the homes and their poor construction, combined with overcrowded conditions and haphazard electricity connections, present a deadly risk to slum residents.
"No reasonable juror," Justice Antonin Scalia wrote for the majority, could fail to see the deadly risk to the public posed by Mr. Harris's flight.
We suspect that it and others like it have health- or fire-code violations that could shut them, without deadly risk.
