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a serious head injury
It's not a serious problem – we should be able to fix it easily.
An accident like this poses a serious threat to the environment.
The sale of the company will have serious implications for people's jobs.
I'm sorry, I didn't realize you were being serious.
The police have made no serious attempt to address these issues.
I'm not convinced they're serious about the deal.
Do you think Mike's serious about going to live in New York?
"Are you serious about leaving your job?" "Dead serious."
Peter seems serious but he actually has a good sense of humor.
This is the American English definition of serious. View British English definition of serious.