| English adjective: deadly | |||
| 1. | deadly causing or capable of causing death | ||
| Samples | A fatal accident. A deadly enemy. Mortal combat. A mortal illness. | ||
| Synonyms | deathly, mortal | ||
| Similar | fatal | ||
| Antonyms | nonfatal | ||
| 2. | deadly of an instrument of certain death | ||
| Samples | Deadly poisons. Lethal weapon. A lethal injection. | ||
| Synonyms | lethal | ||
| Similar | fatal | ||
| Antonyms | nonfatal | ||
| 3. | deadly extremely poisonous or injurious; producing venom | ||
| Samples | Venomous snakes. A virulent insect bite. | ||
| Synonyms | venomous, virulent | ||
| Similar | toxic | ||
| Antonyms | atoxic, nontoxic | ||
| 4. | deadly involving loss of divine grace or spiritual death | ||
| Samples | The seven deadly sins. | ||
| Synonyms | mortal | ||
| Similar | unpardonable | ||
| Domain category | divinity, theology | ||
| Antonyms | pardonable | ||
| 5. | deadly exceedingly harmful | ||
| Synonyms | baneful, pernicious, pestilent | ||
| Similar | noxious | ||
| Antonyms | innocuous | ||
| 6. | deadly (of a disease) having a rapid course and violent effect | ||
| Similar | virulent | ||
| Antonyms | avirulent | ||
| English adverb: deadly | |||
| 1. | deadly as if dead | ||
| Synonyms | lifelessly | ||
| 2. | deadly (used as intensives) extremely | ||
| Samples | She was madly in love. Deadly dull. Deadly earnest. Deucedly clever. Insanely jealous. | ||
| Synonyms | deucedly, devilishly, insanely, madly | ||
| Domain usage | intensifier, intensive | ||