PERILOUS Synonyms: 66 Similar and Opposite Words

Q: How is the word 'perilous' distinct from other similar adjectives?

Some common synonyms of perilous are dangerous , hazardous , precarious , and risky . While all these words mean "bringing or involving the chance of loss or injury," perilous strongly implies the immediacy of danger. // perilous mountain roads

Q: When might 'dangerous' be a better fit than 'perilous'?

The words dangerous and perilous are synonyms, but do differ in nuance. Specifically, dangerous applies to something that may cause harm or loss unless dealt with carefully. // soldiers on a dangerous mission

Q: When is it sensible to use 'hazardous' instead of 'perilous'?

The synonyms hazardous and perilous are sometimes interchangeable, but hazardous implies great and continuous risk of harm or failure. // claims that smoking is hazardous to your health

Q: When can 'precarious' be used instead of 'perilous'?

While in some cases nearly identical to perilous , precarious suggests both insecurity and uncertainty. // earned a precarious living by gambling

Q: When would 'risky' be a good substitute for 'perilous'?

In some situations, the words risky and perilous are roughly equivalent. However, risky often applies to a known and accepted danger. // shied away from risky investments

perilous

adjective

ˈper-ə-ləs

Definition of perilous

as in dangerous

involving potential loss or injury a perilous journey through hostile territory

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How is the word perilous distinct from other similar adjectives?

Some common synonyms of perilous are dangerous, hazardous, precarious, and risky. While all these words mean "bringing or involving the chance of loss or injury," perilous strongly implies the immediacy of danger.

perilous mountain roads

When might dangerous be a better fit than perilous?

The words dangerous and perilous are synonyms, but do differ in nuance. Specifically, dangerous applies to something that may cause harm or loss unless dealt with carefully.

soldiers on a dangerous mission

When is it sensible to use hazardous instead of perilous?

The synonyms hazardous and perilous are sometimes interchangeable, but hazardous implies great and continuous risk of harm or failure.

claims that smoking is hazardous to your health

When can precarious be used instead of perilous?

While in some cases nearly identical to perilous, precarious suggests both insecurity and uncertainty.

earned a precarious living by gambling

When would risky be a good substitute for perilous?

In some situations, the words risky and perilous are roughly equivalent. However, risky often applies to a known and accepted danger.

shied away from risky investments

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of perilous These days, the college education that, in our time, cost about $20,000 for four years is under siege, regarded by some as a waste of time and money, by others as a perilous marination in dangerous ideas. — David Shribman, Christian Science Monitor, 10 Oct. 2026 Williams heads up the Rory Peck Trust, which provides funds and training to aid the security of freelance journalists who are reporting in perilous zones. — David Folkenflik, NPR, 4 Oct. 2026 Alas, for an increasing share of the population, stretching to buy a home is a perilous financial move. — The Editorial Board, Chicago Tribune, 2 Oct. 2026 The shadow that hangs over the entire series, though, is the perilous future of the church. — John Blake, CNN Money, 1 Oct. 2026 See All Example Sentences for perilous

Recent Examples of Synonyms for perilous

Adjective

Swimmers should remain out of the water due to dangerous surf conditions.

— NC Weather Bot, Charlotte Observer, 18 Oct. 2026
Fresh to strong winds will produce dangerous boating conditions, high surf, life-threatening rip currents, and moderate beach erosion through at least the first half of the coming week, forecasters said.

— Felix Rodriguez, The Orlando Sentinel, 18 Oct. 2026

Definition of dangerous

Adjective

Ultimately, the greatest impacts will be determined by the storm's track, but periods of heavy rain and wind, along coastal flooding, beach erosion, and hazardous surf are a concern, especially for the Carolinas and mid-Atlantic.

— ABC News, ABC News, 17 Oct. 2026
Preliminary tests indicate the substance is not hazardous; the letters prompted evacuations and police responses, with no injuries reported in the California incidents described.

— Los Angeles Times, Los Angeles Times, 17 Oct. 2026

Definition of hazardous

Adjective

The fact fraternity alumni donate more makes getting rid of fraternities financially risky for schools.

— Jens Ludwig, Chicago Tribune, 18 Oct. 2026
Representatives Lori Trahan and Jay Obernolte have advanced the FRONTIER Act, which would authorize government intervention against risky models and override some state laws.

— Aamir Khollam, Interesting Engineering, 17 Oct. 2026

Definition of risky

Adjective

The subject is of particular interest at CBS News, where Editor-in-Chief Bari Weiss has repeatedly encouraged the network’s journalists to dedicate serious resources to finding a potential link.

— semafor.com, semafor.com, 19 Oct. 2026
Illinois Republicans are angry that the congressional map is deliberately drawn to their serious disadvantage, with some districts almost comically gerrymandered.

— John T. Shaw, Chicago Tribune, 18 Oct. 2026

Definition of serious

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perilous

perils

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“Perilous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perilous. Accessed 20 Oct. 2026.

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