Deadly means “likely to kill somebody” and can be used to describe almost anything:
The training she received in spy-school made her a deadly secret agent.
The venom of baby snakes is deadlier than that of adult snakes.
With millions of deadly weapons stocked up, maybe we could spend more on education?
Deathly, on the other hands, means “related to, resembling, or evocative of death”—in other words, something that reminds one of death:
Her skin was deathly pale after she donated blood.
More Examples of How to Use "Deadly" in a Sentence
- “She had always been afraid of heights, and now she was standing on the edge of a deadly precipice.”
- Smoking is deadly and is responsible for hundreds of thousands of deaths in the United States each year.
- Secondhand smoke is deadly to both children and adults.
- Texting while driving can be just as deadly as drinking and driving.
- Deadly force should only be used as a last resort.
More Examples of How to Use "Deathly" in a Sentence
- He had a deathly pallor and he was sweating profusely.
- Nathan has a deathly fear of snakes.
- I was deathly afraid of spiders, but I decided to face my fear.
- Lucinda turned a deathly pale color, and she looked like she was going to faint.
- His eyes were a deathly shade of blue, and they seemed to bore into her soul.