Definitions

deadly

[ded-lee] / ˈdɛd li /

ADJECTIVE

causing end of life

Synonyms

STRONGEST

bloody carcinogenic cruel dangerous destructive fatal harmful lethal malignant mortal murderous noxious pernicious poisonous savage suicidal toxic violent virulent

WEAK

baleful baneful bloodthirsty cannibalistic death-dealing deathly deleterious destroying grim homicidal injurious internecine killing mortiferous pestiferous pestilent pestilential ruthless slaying unrelenting venomous

Antonyms

STRONGEST

benign calm gentle harmless healthy helpful kind life-giving nice nonpoisonous wholesome

WEAK

animating energizing healthful invigorating lively

ADJECTIVE

ghostly

Synonyms

STRONGEST

ghastly

WEAK

ashen corpselike dead deadened deathful deathlike deathly pallid wan white

Antonyms

WEAK

animating energizing harmless healthful healthy invigorating lively wholesome

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.

"An El Niño declaration is not just another weather forecast - for millions of people it is a deadly siren to be feared," said Mohamed Adow, director of campaign group Power Shift Africa.

From BBC • Jun. 11, 2026

Erickson, 58, was in a separate AMG Mercedes SUV ahead of Grossman’s vehicle and was also found negligent in the deadly crash.

From Los Angeles Times • Jun. 6, 2026

Left untreated, the infestation can be deadly, and the parasites can quickly spread.

From Barron's • Jun. 4, 2026

Pancreatic cancer is so deadly in part because there are no effective screening tests, and it rarely causes noticeable symptoms in its earliest stages.

From Science Daily • Jun. 4, 2026

The mountains also create wind shear, which is when the wind suddenly changes direction, another deadly hazard to flight.

From "A Thousand Sisters" by Elizabeth Wein

deadly

Example Sentences

Related Words