Definition from macmillandictionary.com
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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.
This is an extremely serious matter.
He has no serious competition for the post.
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.’
We’ll have to give the situation some serious thought.
Peter seems serious but he actually has a good sense of humour.
Is Mary all right? She looked a bit serious.
Is it getting serious with you and June, then?
He’s never had a serious relationship with anyone.
My father is a serious runner.
We did some serious hiking last weekend.
It’s time you made some serious money.