The meaning of DEADLY is likely to cause or capable of producing death. How to use deadly in a sentence. Synonym Discussion of Deadly.

DEADLY definition: 1. likely to cause death: 2. complete or extreme: 3. extremely boring: . Learn more.

deadly, mortal, fatal, and lethal mean causing or able to cause death. deadly describes something that is very dangerous and likely or able to cause death.

Define deadly. deadly synonyms, deadly pronunciation, deadly translation, English dictionary definition of deadly. adj. dead·li·er , dead·li·est 1. Causing or tending to cause death: deadly …

lethal: a deadly poison. aiming to kill or destroy; implacable: a deadly enemy. like death: a deadly pallor. excruciatingly boring: The dinner party was absolutely deadly. excessive; inordinate: …

Dec 21, 2025 · deadly (comparative deadlier or more deadly, superlative deadliest or most deadly) (obsolete, rare) Subject to death; mortal. quotations

DEADLY definition: causing or tending to cause death; fatal; lethal. See examples of deadly used in a sentence.

Definition of deadly adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

deadly definition: causing or able to cause death. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like "deadly earnest", …

Dec 22, 2016 · 3 meanings: 1. likely to cause death 2. informal extremely boring 3. like death in appearance or certainty.... Click for more definitions.