1. causing or tending to cause death; lethal. 2. aiming to kill or destroy; implacable: a deadly enemy. 3. like death. 4. excruciatingly boring. 5. excessive; inordinate: deadly haste.

Add to word list dangerous and able to kill: a deadly poison (Definition of deadly from the Cambridge Academic Content Dictionary © Cambridge University Press)

If you describe a person or their behaviour as deadly, you mean that they will do or say anything to get what they want, without caring about other people.

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

Something that's deadly can kill you. Because a gun can end someone's life, it's a deadly weapon. If someone's diagnosed with a deadly disease, it's lethal — it's capable of ending the person's life.

Synonyms: deathly, fatal, lethal, mortal, killer, more... Collocations: a deadly [virus, illness], a deadly attack on [Paris], the deadly attack on [Monday], more...

deadly, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

deadly, adj. & n. meanings, etymology and more | Oxford English Dictionary

deadly (comparative deadlier or more deadly, superlative deadliest or most deadly) (obsolete, rare) Subject to death; mortal.

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

Find 100 different ways to say DEADLY, along with antonyms, related words, and example sentences at Thesaurus.com.

The California Highway Patrol is updating the public on a deadly crash that occurred Saturday night on Highway 1 in the Moss Landing area.