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

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

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

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 weapons; a …

Find 396 different ways to say DEADLY, along with antonyms, related words, and example sentences at Thesaurus.com.

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: deadly haste. …

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

Obsolete. deadly a1470– Of or relating to death; associated with death. Chiefly and now only in deadly bed (cf. deathbed, n. 1). Cf. deathly, adj. 3b. Now rare. capital c1475– Involving loss of the head or …

Oct 8, 2025 · deadly (comparative deadlier or more deadly, superlative deadliest or most deadly) (obsolete, rare) Subject to death; mortal. quotations