adjective
- requiring careful thought or attention; important
- not joking or playful; earnest
- causing worry or fear; dangerous or bad
Examples
- We need to have a serious discussion about your grades.
- Are you serious about wanting to learn piano?
- The accident caused serious injuries to three people.
- She gave me a serious look when I started laughing.
- Climate change is a serious global problem.
- He’s serious about becoming a doctor.
- The patient is in serious condition at the hospital.