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

deadly, mortal, fatal, lethal mean causing or capable of causing death. deadly applies to an established or very likely cause of death.

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.

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.

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.

Say Drilly x E-Wuu x Nesty Floxks x Lee Drilly - “Deadly” Official Music Video (Shot By Borleone)

Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).

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