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perilous

[per-uh-luh s]
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adjective
  1. involving or full of grave risk or peril; hazardous; dangerous: a perilous voyage across the Atlantic in a small boat.
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Origin of perilous

1250–1300; Middle English < Anglo-French perillous < Latin perīculōsus. See peril, -ous
Related formsper·il·ous·ly, adverbper·il·ous·ness, nounnon·per·il·ous, adjectivenon·per·il·ous·ly, adverbun·per·il·ous, adjectiveun·per·il·ous·ly, adverb

Synonyms

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risky.

Antonyms

safe.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for perilous

perilous

adjective
  1. very hazardous or dangerousa perilous journey
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Derived Formsperilously, adverbperilousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for perilous

adj.

c.1300, from Old French perillos "perilous, dangerous" (Modern French périlleux) "dangerous, hazardous," from Latin periculosus "dangerous, hazardous," from periculum "a danger, attempt, risk" (see peril). Related: Perilously; perilousness.

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Online Etymology Dictionary, © 2010 Douglas Harper