Englishfor English speakers
serious
Adjective
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A problem or situation is serious if it is not funny or comical, but important.
This is a serious problem. We must do something.
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A person is serious if the person is not laughing or joking, but saying what they mean.
I see. When you said the room was empty, you were serious!
The woman's face looked serious, so I knew she was saying something important.
offender
Noun
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An offender is someone or something that does something wrong, usually someone who breaks the law.
The boy who took the car is a young offender, so we can't use his real name.