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Full of or involving peril; dangerous or risky.

per′il·ous·ly adv.
per′il·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.perilousness - the state of being dangerous
danger - the condition of being susceptible to harm or injury; "you are in no danger"; "there was widespread danger of disease"


(ˈperil) noun
great danger. You are in great peril; The explorers knew they would face many perils.
ˈperilous adjective
very dangerous. a perilous journey.
ˈperilousness noun
ˈperilously adverb
dangerously. He came perilously close to death.
References in classic literature ?
No: the reason was this: that from the fatal experiences of the fishery there hung a terrible prestige of perilousness about such a whale as there did about Rinaldo Rinaldini, insomuch that most fishermen were content to recognise him by merely touching their tarpaulins when he would be discovered lounging by them on the sea, without seeking to cultivate a more intimate acquaintance.
The perilousness of this situation is only compounded by the danger posed by the attitude of some Lebanese politicians in such circumstances.
The subtle dust that we breathe in the air, the volatile compounds that pollute our cities, in these works become palpable and visible, alarming in their perilousness.
Being placed in the heart of Roper's world, Pine is struck by the perilousness of his situation, making him more determined to take Roper down.
Perhaps the first step is for the international community to recognize the perilousness of Northeast Asian geopolitics.
His Studies in Classic American Literature attempted for the first time the kind of explication which does not betray the complexity or perilousness of its theme, and in the pages of that little book I found confirmation of my own suspicions that it is duality and outrageousness which determine the quality of those American books ordinarily consigned to the children's shelf in the library.
It matters little, for the perilousness of Vittorio's subjugation of Sonia has been demonstrated.