deadly
word
Definition
Causing death or able to kill. It can also describe something very serious or dangerous, and in informal speech it can mean extremely effective or impressive.
Usage & Nuances
Most commonly used for physical danger: 'a deadly virus', 'a deadly weapon'. 'Deadly' is stronger than 'dangerous' because it suggests death, not just risk. In informal speech, especially before a noun, it can mean very effective or stylish: 'a deadly look' or 'deadly serious' depending on context.
Example Sentences
This snake is deadly.
basic
The police found a deadly weapon.
basic
That combination of speed and power is deadly on the field.
natural
Be careful with that cleaner—some of those chemicals are deadly if swallowed.
natural
Her joke landed at the perfect moment, and the timing was deadly.
natural
The smoke can be deadly in a closed room.
basic