perilous

adjective

per·​il·​ous ˈper-ə-ləs 

ˈpe-rə-

: full of or involving peril

a perilous journey

perilously adverb

perilousness noun

Synonyms

• dangerous
• grave
• grievous
• hazardous
• jeopardizing
• menacing
• parlous
• risky
• serious
• threatening
• unhealthy
• unsafe
• venturesome

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

For now, Michelle and I just want to express our love and gratitude to Joe and Jill for leading us so ably and courageously during these perilous times — and for their commitment to the ideals of freedom and equality that this country was founded on. —Natalie Neysa Alund, USA TODAY, 22 July 2024

Bombardments of giant hail and pinpoint lightning strikes make getting close to a tornado perilous — and the tornadoes themselves can quickly become shrouded in rain or make unexpected moves. —Matthew Cappucci, Washington Post, 21 July 2024

Google Maps After a nearly three-hour perilous journey and with only 262 feet (80 m) to go, Roose fell from his slackline in what must have been a heartbreak. —New Atlas, 11 July 2024

Thousands of West African migrants take on perilous crossings on the Atlantic Ocean and the Mediterranean Sea to reach Europe in search of jobs and opportunities every year. —Mohammed Tawfeeq, CNN, 4 July 2024

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

Kids Definition

perilous

adjective

per·​il·​ous ˈper-ə-ləs 

: full of or involving peril

perilously adverb

perilousness noun