We use serious when someone thinks deeply or cares a lot about something. It means they are not playing or joking. It shows they are focused and thoughtful.
She looks very serious today.
He was serious about his work.
Serious means something is very important and may cause harm or trouble. It needs careful attention and help. It is not small or easy to fix.
He has a serious illness now.
The problem is serious for our plan.
Serious describes a person who is calm and does not smile or laugh much. It shows they are formal or strict in their behavior.
He made a serious face at the joke.
The teacher looked serious in class.
We say serious about things that matter a lot. They can change situations or have big results. It is more than normal or easy things.
This is a serious choice to make.
The damage is serious after the storm.
Serious is used when someone shows deep feelings like sadness or worry. It means they are not happy or relaxed.
She was serious after the bad news.
He has a serious look on his face.
When we ask if someone is serious, we want to know if they really mean something and are not joking. It shows honesty and truth.
Are you serious about moving abroad?
I am serious; I will help you.
A serious person often thinks carefully and does not joke much. They may be quiet and respectful.
He is a serious student at school.
My friend is very serious and quiet.
