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deadliest

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.

It was one of America’s deadliest mining accidents and inspired the Federal Mine Safety & Health Act of 1977.

From The Wall Street Journal • Jun. 4, 2026

“Daraxonrasib significantly elevates the survival bar in the treatment of one of the deadliest human cancers, while better preserving quality of life compared with chemotherapy,” Mark A. Goldsmith, M.D.,

From MarketWatch • Jun. 1, 2026

The deadliest Ebola outbreak in the DRC claimed nearly 2,300 lives out of 3,500 cases between 2018 and 2020.

From Barron's • May 18, 2026

DR Congo's deadliest outbreak was between 2018 and 2020, during which nearly 2,300 people died.

From BBC • May 15, 2026

The scientists inside the highly secure facility had to wear futuristic-looking BSL-4-positive pressure “spacesuits,” because they worked exclusively with the deadliest viruses on the planet.

From "City Spies" by James Ponti