dangerous

[deyn-jer-uhs, deynj-ruhs]

adjective

1. full of danger danger or risk; causing danger; danger; perilous; risky; hazardous; unsafe.

2. able or likely to cause physical injury.

   a dangerous criminal.

dangerous

/ ˈdeɪndʒərəs /

adjective

1. causing danger; perilous

Other Word Forms

• dangerously adverb
• dangerousness noun
• nondangerous adjective
• nondangerously adverb
• nondangerousness noun
• quasi-dangerous adjective
• quasi-dangerously adverb
• semidangerous adjective
• semidangerously adverb
• semidangerousness noun
• undangerous adjective
• undangerously adverb

Word History and Origins

Origin of dangerous¹

First recorded in 1175–1225; Middle English da(u)ngerous “domineering, fraught with danger,” from Old French dangereus “threatening, difficult,” equivalent to dangier ( danger ) + -eus -ous

Idioms and Phrases

see little knowledge is a dangerous thing; live dangerously.

Example Sentences

The same could be said of Europe as a whole during this dangerous new era.

Read more on The Wall Street Journal

Judge Lady Ross said: "This was clearly a dangerous thing to do."

Read more on BBC

The fierce heat of the blaze, as well as dangerous debris and the risk posed from collapsing scaffolding, has hampered rescue efforts, but the fire department has so far rescued 55 people.

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The Cardinals can be dangerous and give teams a scare almost every week, but the Buccaneers are healthier and returning home with urgency.

Read more on Los Angeles Times

A no less dangerous aspect of any future involving the Golden Dome would be the creation of a new set of space-based interceptors as an integral part of the system.

Read more on Salon

Related Words

• alarming 
• bad 
• critical 
• deadly 
• fatal 
• nasty 
• perilous 
• precarious 
• risky 
• serious 
• terrible 
• threatening 
• treacherous 
• ugly 
• unhealthy 
• unsafe 
• unstable