Definition of Serious

requiring careful thought and deep consideration

Examples of Serious in a sentence

I thought you were joking about how much weight you’ve lost, but now I can see that you were serious.  

It’s time to get serious about test prep so that you can achieve a score high enough for admission.  

The teacher had a serious look on her face as she disciplined the mischievous adolescent.  

You should be more serious about driver’s education or else you will never learn to drive!  

Warning residents to evacuate immediately, the meteorologist insisted that the approaching hurricane was a serious problem.  

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