perilous

adjective

per·​il·​ous ˈper-ə-ləs 

ˈpe-rə-

: full of or involving peril

a perilous journey

perilously adverb

perilousness noun

Synonyms

• dangerous
• hazardous
• risky
• serious

Choose the Right Synonym for perilous

dangerous, hazardous, precarious, perilous, risky mean bringing or involving the chance of loss or injury.

dangerous applies to something that may cause harm or loss unless dealt with carefully.

soldiers on a dangerous mission

hazardous implies great and continuous risk of harm or failure.

claims that smoking is hazardous to your health

precarious suggests both insecurity and uncertainty.

earned a precarious living by gambling

perilous strongly implies the immediacy of danger.

perilous mountain roads

risky often applies to a known and accepted danger.

shied away from risky investments

Examples of perilous in a Sentence

a perilous journey across the mountains

a perilous journey through hostile territory

Recent Examples on the Web

And the Orizzonti jury prize was handed to Japanese director Akio Fujimoto for his drama Lost Land, the story of two Rohingya child refugees on a perilous journey to reach Malaysia. —Patrick Brzeski, HollywoodReporter, 6 Sep. 2025

Understanding the gravity of a red flag warning and adhering to these precautions is paramount in averting wildfires during these perilous conditions. —Ca Weather Bot, Sacbee.com, 2 Sep. 2025

But when Veronique reappears, revealing the truth of her birth, Marie-Louise must navigate the dangers of a France on the brink of revolution, where royal ties can be perilous. —Ashlee Conour, Chicago Tribune, 2 Sep. 2025

As in his previous films, a clanking, rattling soundscape constructed entirely in post is an artisanal marvel, immersing viewers both in the perilous metallic din of a maybe-sinking ship, and the comforting artifice of analog movie-making. —Guy Lodge, Variety, 31 Aug. 2025

Word History

Etymology

Middle English perilous, perelous, borrowed from Anglo-French perilleus, perillous, going back to Latin perīculōsus, from perīculum "test, risk, peril entry 1" + -ōsus -ous

First Known Use

14th century, in the meaning defined above

Rhymes for perilous

• carolus
• garrulous
• querulous
• puberulous

Kids Definition

perilous

adjective

per·​il·​ous ˈper-ə-ləs 

: full of or involving peril

perilously adverb

perilousness noun