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perilous

American  
[per-uh-luhs] / ˈpɛr ə ləs /

adjective

  1. involving or full of grave risk or peril; hazardous; dangerous.

    a perilous voyage across the Atlantic in a small boat.

    Synonyms:
    risky
    Antonyms:
    safe

perilous British  
/ ˈpɛrɪləs /

adjective

  1. very hazardous or dangerous

    a perilous journey

"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

Other Word Forms

Etymology

Origin of perilous

First recorded in 1250–1300; Middle English, from Anglo-French perillous, from Latin perīculōsus; see peril, -ous

Explanation

Something that is dangerous or very risky can be described with the adjective perilous. If you are driving in a blizzard, you may kick yourself for making such a perilous journey. The adjective perilous comes from the Latin word periculum, meaning dangerous. Words from the same root include peril, a noun meaning a dangerous situation, and imperil, a verb meaning to put in danger. The last thing you want to do as a parent is to imperil your children. Unfortunately, childhood is filled with peril — from climbing on the monkey bars to eating paste, dirt, or bugs. If you think you can prevent all perilous situations, you haven't been a parent very long!

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Vocabulary lists containing perilous

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Apollo 13’s story was told in the 1994 book “Lost Moon: The Perilous Voyage of Apollo 13,” co-authored by Lovell, and in the 1995 movie “Apollo 13,” where Gary Sinise played Mattingly.

From Seattle Times • Nov. 3, 2023

"Perilous, crisis: these are not buzz words. This is the truth of what we're seeing."

From BBC • Oct. 5, 2022

Perilous moments such as crocodiles hunting fish or large animals hunting smaller prey are accompanied by suspenseful music, lending a dramatic tone.

From Washington Post • Apr. 29, 2022

"Perilous conditions are hampering our efforts to access civilians - or for them to access us. Civilians must be allowed to move to safer areas without the fear of attacks," Griffiths told the U.N.

From Reuters • Apr. 5, 2022

It was Captain Underpants and the Perilous Plot of Professor Poopypants, the same one I’d been reading before.

From Absolutely Almost by Lisa Graff