involving or full of grave risk or peril; hazardous; dangerous: a perilous voyage across the Atlantic in a small boat.

1250–1300; Middle English < Anglo-French perillous < Latin perīculōsus. See peril, -ous

perilously, adverb
perilousness, noun
nonperilous, adjective
nonperilously, adverb
unperilous, adjective
unperilously, adverb


safe. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perilous (ˈpɛrɪləs)
very hazardous or dangerous: a perilous journey

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., from O.Fr. perillous (Fr. périlleux) "dangerous, hazardous," from L. periculosus, from periculum "dangerous" (see peril).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Her perilous dash from sandy nest to open sea is the first of many dangerous
  journeys she makes.
The last thousand feet down a steep slope of frozen, windswept scree were
  especially perilous.
The crabs' have a surprising and perilous migration from the island's interior
  to the sea.
Crosswalks can be especially perilous for the elderly.
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