The phrase "a dangerous task" is correct and usable in written English.
You can use it to describe an activity or job that poses a significant risk or threat to safety.
Example: "Climbing the mountain without proper gear is a dangerous task that should not be taken lightly."
Alternatives: "a risky endeavor" or "a perilous job".
Arresting deserters was frequently a dangerous task.
One might think that invading a bald eagle nest to gather and band the chicks is a dangerous task.
Information in the investigative report, and also from earlier investigations, indicates that the calamity happened because Sangji performed a dangerous task incorrectly.
Nevertheless, it is a dangerous task to involve human workers to operate such heavy machines in these conditions as there is chance of tip over of these machines due to instability.
It is a dangerous task for the idealist to undertake, and one that will probably end badly for the idealist because rulers don't like to be lectured on their failings.
The new regimen appears to lower the chances that any member of a UC lab will again undertake a dangerous task as poorly trained, clad, and equipped as Sangji was that day in 2008.
Born in Milan but steeped in the Austro-German habit, Chailly had a more dangerous task: to take on, or almost dismantle, an entire tradition lasting nearly two centuries.
It was an extremely dangerous task, and would have been fruitless if their messages had been intercepted.
He has to move bodies around and crash a land-rover, a demeaning and dangerous task which sours him.
Civil rights activists who spoke out at a time when lynchings were accepted and commonplace took on a much more dangerous task than those born in the America of Barack Obama.
Let's respect the value of human life and admit that nation-building is a difficult and dangerous task.
