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The sale of the company will have serious implications for people's jobs.
It's not a serious problem – we should be able to fix it without too much trouble.
a serious head injury
An accident like this poses a serious threat to the environment.
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 Zealand?
'Are you serious about leaving your job?' 'Dead serious.'
This is the British English definition of serious. View American English definition of serious.