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

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 for perilous

Antonyms for perilous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for perilous

Contemporary Examples of perilous

Historical Examples of perilous

British Dictionary definitions for perilous



very hazardous or dangerousa perilous journey
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

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.

Online Etymology Dictionary, © 2010 Douglas Harper