Deadly | Mean of deadly in English Dictionary

/ˈdɛdli/

• causing or able to cause death
1. deadly weapons
2. the world's most deadly snake
3. a more deadly form of the disease
4. They launched a deadly attack.
5. Officers are allowed to use deadly force if necessary.
• extremely accurate and effective
1. She shoots with deadly accuracy.
2. a basketball player with deadly aim
• extreme or complete
1. A deadly silence followed his question.
2. The two gang leaders are deadly enemies.
3. He spoke with deadly seriousness.

• very boring
1. The lecture was pretty deadly.
• extremely or completely
1. He's deadly [=dead] serious about finding another job.
2. a deadly boring/dull meeting