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perilous

adjective
 
 
/ˈper.əl.əs/ formal

Definition

extremely dangerous: The country roads are quite perilous.Dangers and threats perilously
 
 
/-li/ adverb
She came perilously close to getting herself killed in her attempt to break the world record.Dangers and threats
(Definition of perilous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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